78072939 has 24 divisors (see below), whose sum is σ = 129570272. Its totient is φ = 44375040.

The previous prime is 78072937. The next prime is 78072977. The reversal of 78072939 is 93927087.

It is not a de Polignac number, because 78072939 - 2¹ = 78072937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78072894 and 78072903.

It is not an unprimeable number, because it can be changed into a prime (78072937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8949 + ... + 15369.

Almost surely, 2^78072939 is an apocalyptic number.

78072939 is a deficient number, since it is larger than the sum of its proper divisors (51497333).

78072939 is a wasteful number, since it uses less digits than its factorization.

78072939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6627 (or 6624 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 78072939 is about 8835.8892591521. The cubic root of 78072939 is about 427.3990076404.

The spelling of 78072939 in words is "seventy-eight million, seventy-two thousand, nine hundred thirty-nine".