78492681 has 12 divisors (see below), whose sum is σ = 113547460. Its totient is φ = 52250400.

The previous prime is 78492653. The next prime is 78492719. The reversal of 78492681 is 18629487.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 60140025 = 4284^2 + 7755^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78492681 is a prime.

It is a super-2 number, since 2×78492681² = 12322201941135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78492611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231 + ... + 12531.

Almost surely, 2^78492681 is an apocalyptic number.

It is an amenable number.

78492681 is a deficient number, since it is larger than the sum of its proper divisors (35054779).

78492681 is a wasteful number, since it uses less digits than its factorization.

78492681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13016 (or 13013 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 78492681 is about 8859.6095286418. The cubic root of 78492681 is about 428.1635780393.

The spelling of 78492681 in words is "seventy-eight million, four hundred ninety-two thousand, six hundred eighty-one".