78055720 has 32 divisors (see below), whose sum is σ = 179366400. Its totient is φ = 30557248.

The previous prime is 78055717. The next prime is 78055739. The reversal of 78055720 is 2755087.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18880 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (5605200).

Almost surely, 2^78055720 is an apocalyptic number.

It is an amenable number.

78055720 is an abundant number, since it is smaller than the sum of its proper divisors (101310680).

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

78055720 is a wasteful number, since it uses less digits than its factorization.

78055720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41577 (or 41573 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 78055720 is about 8834.9148269805. The cubic root of 78055720 is about 427.3675843555.

The spelling of 78055720 in words is "seventy-eight million, fifty-five thousand, seven hundred twenty".