86715621 has 12 divisors (see below), whose sum is σ = 127126272. Its totient is φ = 56947176.

The previous prime is 86715617. The next prime is 86715683. The reversal of 86715621 is 12651768.

It is not a de Polignac number, because 86715621 - 2² = 86715617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86815621) 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, 71301 + ... + 72506.

It is an arithmetic number, because the mean of its divisors is an integer number (10593856).

Almost surely, 2^86715621 is an apocalyptic number.

It is an amenable number.

86715621 is a deficient number, since it is larger than the sum of its proper divisors (40410651).

86715621 is a wasteful number, since it uses less digits than its factorization.

86715621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143880 (or 143877 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 86715621 is about 9312.1222607953. The cubic root of 86715621 is about 442.6214394261.

The spelling of 86715621 in words is "eighty-six million, seven hundred fifteen thousand, six hundred twenty-one".