78131927864 has 16 divisors (see below), whose sum is σ = 146521006920. Its totient is φ = 39059659360.

The previous prime is 78131927849. The next prime is 78131927879. The reversal of 78131927864 is 46872913187.

It is an interprime number because it is at equal distance from previous prime (78131927849) and next prime (78131927879).

It is a super-2 number, since 2×78131927864² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 735194 + ... + 834729.

Almost surely, 2^78131927864 is an apocalyptic number.

It is an amenable number.

78131927864 is a deficient number, since it is larger than the sum of its proper divisors (68389079056).

78131927864 is a wasteful number, since it uses less digits than its factorization.

78131927864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576150 (or 1576146 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 56.

The spelling of 78131927864 in words is "seventy-eight billion, one hundred thirty-one million, nine hundred twenty-seven thousand, eight hundred sixty-four".