78587344931 has 4 divisors (see below), whose sum is σ = 82723521000. Its totient is φ = 74451168864.

The previous prime is 78587344889. The next prime is 78587344961. The reversal of 78587344931 is 13944378587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78587344931 - 2³⁰ = 77513603107 is a prime.

It is a super-2 number, since 2×78587344931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78587344961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068088006 + ... + 2068088043.

It is an arithmetic number, because the mean of its divisors is an integer number (20680880250).

Almost surely, 2^78587344931 is an apocalyptic number.

78587344931 is a deficient number, since it is larger than the sum of its proper divisors (4136176069).

78587344931 is a wasteful number, since it uses less digits than its factorization.

78587344931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4136176068.

The product of its digits is 20321280, while the sum is 59.

The spelling of 78587344931 in words is "seventy-eight billion, five hundred eighty-seven million, three hundred forty-four thousand, nine hundred thirty-one".