78655257 has 12 divisors (see below), whose sum is σ = 113705904. Its totient is φ = 52394040.

The previous prime is 78655223. The next prime is 78655267. The reversal of 78655257 is 75255687.

It is not a de Polignac number, because 78655257 - 2⁸ = 78655001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78655217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11358 + ... + 16920.

It is an arithmetic number, because the mean of its divisors is an integer number (9475492).

Almost surely, 2^78655257 is an apocalyptic number.

It is an amenable number.

78655257 is a deficient number, since it is larger than the sum of its proper divisors (35050647).

78655257 is a wasteful number, since it uses less digits than its factorization.

78655257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7140 (or 7137 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 78655257 is about 8868.7799048122. The cubic root of 78655257 is about 428.4589818803.

The spelling of 78655257 in words is "seventy-eight million, six hundred fifty-five thousand, two hundred fifty-seven".