86720651 has 4 divisors (see below), whose sum is σ = 86745792. Its totient is φ = 86695512.

The previous prime is 86720639. The next prime is 86720653. The reversal of 86720651 is 15602768.

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 86720651 - 2¹⁰ = 86719627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86720653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6380 + ... + 14633.

It is an arithmetic number, because the mean of its divisors is an integer number (21686448).

Almost surely, 2^86720651 is an apocalyptic number.

86720651 is a deficient number, since it is larger than the sum of its proper divisors (25141).

86720651 is a wasteful number, since it uses less digits than its factorization.

86720651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25140.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 86720651 is about 9312.3923349481. The cubic root of 86720651 is about 442.6299974489.

The spelling of 86720651 in words is "eighty-six million, seven hundred twenty thousand, six hundred fifty-one".