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BaseRepresentation
bin1100001100010…
…10110100001001
321010110101102002
412012022310021
5202140433312
614052120345
72351240516
oct606126411
9233411362
10102280457
1152809904
122a3060b5
13182617a6
14d82630d
158ea54c2

102280457 has 4 divisors (see below), whose sum is σ = 102315540. Its totient is φ = 102245376.

The previous prime is 102280447. The next prime is 102280463. The reversal of 102280457 is 754082201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754082201 = 2063365527.

It can be written as a sum of positive squares in 2 ways, for example, as 39300361 + 62980096 = 6269^2 + 7936^2 .

It is a cyclic number.

It is not a de Polignac number, because 102280457 - 24 = 102280441 is a prime.

It is a super-2 number, since 2×1022804572 = 20922583768257698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102280447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12728 + ... + 19145.

It is an arithmetic number, because the mean of its divisors is an integer number (25578885).

Almost surely, 2102280457 is an apocalyptic number.

It is an amenable number.

102280457 is a deficient number, since it is larger than the sum of its proper divisors (35083).

102280457 is an equidigital number, since it uses as much as digits as its factorization.

102280457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35082.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 102280457 is about 10113.3800976726. The cubic root of 102280457 is about 467.6607120921.

The spelling of 102280457 in words is "one hundred two million, two hundred eighty thousand, four hundred fifty-seven".

Divisors: 1 3209 31873 102280457