78387584920 has 16 divisors (see below), whose sum is σ = 176372066160. Its totient is φ = 31355033952.

The previous prime is 78387584893. The next prime is 78387584923. The reversal of 78387584920 is 2948578387.

It is a super-2 number, since 2×78387584920² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78387584923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979844772 + ... + 979844851.

It is an arithmetic number, because the mean of its divisors is an integer number (11023254135).

Almost surely, 2^78387584920 is an apocalyptic number.

It is an amenable number.

78387584920 is an abundant number, since it is smaller than the sum of its proper divisors (97984481240).

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

78387584920 is a wasteful number, since it uses less digits than its factorization.

78387584920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959689634 (or 1959689630 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 78387584920 in words is "seventy-eight billion, three hundred eighty-seven million, five hundred eighty-four thousand, nine hundred twenty".