78725757 has 16 divisors (see below), whose sum is σ = 119490048. Its totient is φ = 45637680.

The previous prime is 78725743. The next prime is 78725821. The reversal of 78725757 is 75752787.

It is not a de Polignac number, because 78725757 - 2⁴ = 78725741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78725557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51103 + ... + 52620.

It is an arithmetic number, because the mean of its divisors is an integer number (7468128).

Almost surely, 2^78725757 is an apocalyptic number.

It is an amenable number.

78725757 is a deficient number, since it is larger than the sum of its proper divisors (40764291).

78725757 is a wasteful number, since it uses less digits than its factorization.

78725757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103760.

The product of its digits is 960400, while the sum is 48.

The square root of 78725757 is about 8872.7536312015. The cubic root of 78725757 is about 428.5869552629.

The spelling of 78725757 in words is "seventy-eight million, seven hundred twenty-five thousand, seven hundred fifty-seven".