78059781990 has 24 divisors (see below), whose sum is σ = 202955433408. Its totient is φ = 20815941840.

The previous prime is 78059781941. The next prime is 78059782013. The reversal of 78059781990 is 9918795087.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 433665366 + ... + 433665545.

It is an arithmetic number, because the mean of its divisors is an integer number (8456476392).

Almost surely, 2^78059781990 is an apocalyptic number.

78059781990 is an abundant number, since it is smaller than the sum of its proper divisors (124895651418).

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

78059781990 is a wasteful number, since it uses less digits than its factorization.

78059781990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867330924 (or 867330921 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 63.

The spelling of 78059781990 in words is "seventy-eight billion, fifty-nine million, seven hundred eighty-one thousand, nine hundred ninety".