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68780101 = 135290777
BaseRepresentation
bin1000001100110…
…00000001000101
311210102101120011
410012120001011
5120101430401
610454110221
71463423035
oct406300105
9153371504
1068780101
1135908565
121b04b371
13113324b0
1491c58c5
156089451
hex4198045

68780101 has 4 divisors (see below), whose sum is σ = 74070892. Its totient is φ = 63489312.

The previous prime is 68780093. The next prime is 68780111. The reversal of 68780101 is 10108786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 63984001 = 2190^2 + 7999^2 .

It is a cyclic number.

It is not a de Polignac number, because 68780101 - 23 = 68780093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68780111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2645376 + ... + 2645401.

It is an arithmetic number, because the mean of its divisors is an integer number (18517723).

Almost surely, 268780101 is an apocalyptic number.

It is an amenable number.

68780101 is a deficient number, since it is larger than the sum of its proper divisors (5290791).

68780101 is a wasteful number, since it uses less digits than its factorization.

68780101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5290790.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 68780101 is about 8293.3769358447. The cubic root of 68780101 is about 409.7204141879.

Adding to 68780101 its reverse (10108786), we get a palindrome (78888887).

The spelling of 68780101 in words is "sixty-eight million, seven hundred eighty thousand, one hundred one".

Divisors: 1 13 5290777 68780101