78309900 has 54 divisors (see below), whose sum is σ = 245460852. Its totient is φ = 20882400.

The previous prime is 78309899. The next prime is 78309911. The reversal of 78309900 is 990387.

It is a super-2 number, since 2×78309900² = 12264880876020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 42606 + ... + 44405.

Almost surely, 2^78309900 is an apocalyptic number.

It is an amenable number.

78309900 is an abundant number, since it is smaller than the sum of its proper divisors (167150952).

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

78309900 is a wasteful number, since it uses less digits than its factorization.

78309900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87031 (or 87021 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 78309900 is about 8849.2881069609. The cubic root of 78309900 is about 427.8309738135.

The spelling of 78309900 in words is "seventy-eight million, three hundred nine thousand, nine hundred".