78075720 has 48 divisors (see below), whose sum is σ = 253747260. Its totient is φ = 20820096.

The previous prime is 78075707. The next prime is 78075721. The reversal of 78075720 is 2757087.

78075720 is a `hidden beast` number, since 7 + 80 + 7 + 572 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75585636 + 2490084 = 8694^2 + 1578^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (78075721) 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 11 ways as a sum of consecutive naturals, for example, 108079 + ... + 108798.

Almost surely, 2^78075720 is an apocalyptic number.

It is an amenable number.

78075720 is an abundant number, since it is smaller than the sum of its proper divisors (175671540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78075720 is a wasteful number, since it uses less digits than its factorization.

78075720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216894 (or 216887 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 78075720 is about 8836.0466273102. The cubic root of 78075720 is about 427.4040823075.

The spelling of 78075720 in words is "seventy-eight million, seventy-five thousand, seven hundred twenty".