78557477020 has 72 divisors (see below), whose sum is σ = 191177274960. Its totient is φ = 26885959680.

The previous prime is 78557476973. The next prime is 78557477077. The reversal of 78557477020 is 2077475587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 554205 + ... + 681364.

It is an arithmetic number, because the mean of its divisors is an integer number (2655239930).

Almost surely, 2^78557477020 is an apocalyptic number.

It is an amenable number.

78557477020 is an abundant number, since it is smaller than the sum of its proper divisors (112619797940).

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

78557477020 is a wasteful number, since it uses less digits than its factorization.

78557477020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235623 (or 1235604 counting only the distinct ones).

The product of its (nonzero) digits is 3841600, while the sum is 52.

The spelling of 78557477020 in words is "seventy-eight billion, five hundred fifty-seven million, four hundred seventy-seven thousand, twenty".