78940816 has 10 divisors (see below), whose sum is σ = 152947862. Its totient is φ = 39470400.

The previous prime is 78940793. The next prime is 78940817. The reversal of 78940816 is 61804987.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 13395600 = 8096^2 + 3660^2 .

It is not an unprimeable number, because it can be changed into a prime (78940817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2466885 + ... + 2466916.

Almost surely, 2^78940816 is an apocalyptic number.

It is an amenable number.

78940816 is a deficient number, since it is larger than the sum of its proper divisors (74007046).

78940816 is a wasteful number, since it uses less digits than its factorization.

78940816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933809 (or 4933803 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78940816 is about 8884.8644334058. The cubic root of 78940816 is about 428.9768644145.

The spelling of 78940816 in words is "seventy-eight million, nine hundred forty thousand, eight hundred sixteen".