78361988 has 24 divisors (see below), whose sum is σ = 141872640. Its totient is φ = 37846080.

The previous prime is 78361979. The next prime is 78361991. The reversal of 78361988 is 88916387.

It is a happy number.

It is a super-2 number, since 2×78361988² = 12281202326624288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14573 + ... + 19211.

It is an arithmetic number, because the mean of its divisors is an integer number (5911360).

Almost surely, 2^78361988 is an apocalyptic number.

It is an amenable number.

78361988 is a deficient number, since it is larger than the sum of its proper divisors (63510652).

78361988 is a wasteful number, since it uses less digits than its factorization.

78361988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4787 (or 4785 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 78361988 is about 8852.2306793260. The cubic root of 78361988 is about 427.9258103567.

The spelling of 78361988 in words is "seventy-eight million, three hundred sixty-one thousand, nine hundred eighty-eight".