78629713981 has 32 divisors (see below), whose sum is σ = 107860757760. Its totient is φ = 55471205376.

The previous prime is 78629713961. The next prime is 78629713993. The reversal of 78629713981 is 18931792687.

It is a cyclic number.

It is not a de Polignac number, because 78629713981 - 2¹⁵ = 78629681213 is a prime.

It is a super-2 number, since 2×78629713981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78629713931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1308166 + ... + 1366951.

It is an arithmetic number, because the mean of its divisors is an integer number (3370648680).

Almost surely, 2^78629713981 is an apocalyptic number.

It is an amenable number.

78629713981 is a deficient number, since it is larger than the sum of its proper divisors (29231043779).

78629713981 is a wasteful number, since it uses less digits than its factorization.

78629713981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675173.

The product of its digits is 9144576, while the sum is 61.

The spelling of 78629713981 in words is "seventy-eight billion, six hundred twenty-nine million, seven hundred thirteen thousand, nine hundred eighty-one".