78023817 has 20 divisors (see below), whose sum is σ = 118204416. Its totient is φ = 51279480.

The previous prime is 78023753. The next prime is 78023837. The reversal of 78023817 is 71832087.

It is not a de Polignac number, because 78023817 - 2⁶ = 78023753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78023837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1033 + ... + 12534.

Almost surely, 2^78023817 is an apocalyptic number.

It is an amenable number.

78023817 is a deficient number, since it is larger than the sum of its proper divisors (40180599).

78023817 is a wasteful number, since it uses less digits than its factorization.

78023817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13650 (or 13641 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78023817 is about 8833.1091355196. The cubic root of 78023817 is about 427.3093517408.

The spelling of 78023817 in words is "seventy-eight million, twenty-three thousand, eight hundred seventeen".