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128330457 = 342776819
BaseRepresentation
bin1111010011000…
…10101011011001
322221110212021220
413221202223121
5230323033312
620422322253
73115535163
oct751425331
9287425256
10128330457
1166491632
1236b89389
13207828a8
1413087933
15b3edc8c
hex7a62ad9

128330457 has 4 divisors (see below), whose sum is σ = 171107280. Its totient is φ = 85553636.

The previous prime is 128330407. The next prime is 128330459. The reversal of 128330457 is 754033821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128330457 - 27 = 128330329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128330459) 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, 21388407 + ... + 21388412.

It is an arithmetic number, because the mean of its divisors is an integer number (42776820).

Almost surely, 2128330457 is an apocalyptic number.

It is an amenable number.

128330457 is a deficient number, since it is larger than the sum of its proper divisors (42776823).

128330457 is an equidigital number, since it uses as much as digits as its factorization.

128330457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42776822.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 128330457 is about 11328.3033592855. The cubic root of 128330457 is about 504.4017449031.

The spelling of 128330457 in words is "one hundred twenty-eight million, three hundred thirty thousand, four hundred fifty-seven".

Divisors: 1 3 42776819 128330457