86573721 has 8 divisors (see below), whose sum is σ = 124311040. Its totient is φ = 53276112.

The previous prime is 86573719. The next prime is 86573737. The reversal of 86573721 is 12737568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 86573721 - 2¹ = 86573719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2219839 = 86573721 / (8 + 6 + 5 + 7 + 3 + 7 + 2 + 1).

It is the 9305-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86573721.

It is not an unprimeable number, because it can be changed into a prime (86573521) by changing a digit.

It is a nontrivial repunit in base 9304.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109881 + ... + 1109958.

It is an arithmetic number, because the mean of its divisors is an integer number (15538880).

Almost surely, 2^86573721 is an apocalyptic number.

It is an amenable number.

86573721 is a deficient number, since it is larger than the sum of its proper divisors (37737319).

86573721 is a wasteful number, since it uses less digits than its factorization.

86573721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219855.

The product of its digits is 70560, while the sum is 39.

The square root of 86573721 is about 9304.5000403031. The cubic root of 86573721 is about 442.3798748267.

The spelling of 86573721 in words is "eighty-six million, five hundred seventy-three thousand, seven hundred twenty-one".