71912630987 has 4 divisors (see below), whose sum is σ = 71914653240. Its totient is φ = 71910608736.

The previous prime is 71912630953. The next prime is 71912631001. The reversal of 71912630987 is 78903621917.

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 71912630987 - 2³² = 67617663691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71912630917) 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, 956813 + ... + 1029230.

It is an arithmetic number, because the mean of its divisors is an integer number (17978663310).

Almost surely, 2^71912630987 is an apocalyptic number.

71912630987 is a deficient number, since it is larger than the sum of its proper divisors (2022253).

71912630987 is a wasteful number, since it uses less digits than its factorization.

71912630987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022252.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 71912630987 in words is "seventy-one billion, nine hundred twelve million, six hundred thirty thousand, nine hundred eighty-seven".