87678886931 has 4 divisors (see below), whose sum is σ = 87824775864. Its totient is φ = 87532998000.

The previous prime is 87678886927. The next prime is 87678886949. The reversal of 87678886931 is 13968887678.

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 87678886931 - 2² = 87678886927 is a prime.

It is a super-2 number, since 2×87678886931² (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 (87678886961) 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, 72943565 + ... + 72944766.

It is an arithmetic number, because the mean of its divisors is an integer number (21956193966).

Almost surely, 2^87678886931 is an apocalyptic number.

87678886931 is a deficient number, since it is larger than the sum of its proper divisors (145888933).

87678886931 is a wasteful number, since it uses less digits than its factorization.

87678886931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145888932.

The product of its digits is 195084288, while the sum is 71.

The spelling of 87678886931 in words is "eighty-seven billion, six hundred seventy-eight million, eight hundred eighty-six thousand, nine hundred thirty-one".