78030657 has 12 divisors (see below), whose sum is σ = 112868964. Its totient is φ = 51947520.

The previous prime is 78030647. The next prime is 78030671. The reversal of 78030657 is 75603087.

It can be written as a sum of positive squares in 2 ways, for example, as 21013056 + 57017601 = 4584^2 + 7551^2 .

It is not a de Polignac number, because 78030657 - 2⁸ = 78030401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78030607) 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, 1153 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (9405747).

Almost surely, 2^78030657 is an apocalyptic number.

It is an amenable number.

78030657 is a deficient number, since it is larger than the sum of its proper divisors (34838307).

78030657 is a wasteful number, since it uses less digits than its factorization.

78030657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12160 (or 12157 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 78030657 is about 8833.4963066727. The cubic root of 78030657 is about 427.3218381441.

It can be divided in two parts, 78030 and 657, that added together give a palindrome (78687).

The spelling of 78030657 in words is "seventy-eight million, thirty thousand, six hundred fifty-seven".