78390988 has 18 divisors (see below), whose sum is σ = 148549884. Its totient is φ = 36180144.

The previous prime is 78390953. The next prime is 78390997. The reversal of 78390988 is 88909387.

It is a super-2 number, since 2×78390988² = 12290293999232288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57306 + ... + 58657.

Almost surely, 2^78390988 is an apocalyptic number.

It is an amenable number.

78390988 is a deficient number, since it is larger than the sum of its proper divisors (70158896).

78390988 is a wasteful number, since it uses less digits than its factorization.

78390988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115993 (or 115978 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 78390988 is about 8853.8685330199. The cubic root of 78390988 is about 427.9785924018.

The spelling of 78390988 in words is "seventy-eight million, three hundred ninety thousand, nine hundred eighty-eight".