78903621916 has 48 divisors (see below), whose sum is σ = 160551982080. Its totient is φ = 33228181440.

The previous prime is 78903621883. The next prime is 78903621917. The reversal of 78903621916 is 61912630987.

It is a happy number.

It is a super-2 number, since 2×78903621916² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78903621917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4320781 + ... + 4339003.

It is an arithmetic number, because the mean of its divisors is an integer number (3344832960).

Almost surely, 2^78903621916 is an apocalyptic number.

It is an amenable number.

78903621916 is an abundant number, since it is smaller than the sum of its proper divisors (81648360164).

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

78903621916 is a wasteful number, since it uses less digits than its factorization.

78903621916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20914 (or 20912 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 78903621916 in words is "seventy-eight billion, nine hundred three million, six hundred twenty-one thousand, nine hundred sixteen".