86357721 has 8 divisors (see below), whose sum is σ = 115197280. Its totient is φ = 57544992.

The previous prime is 86357701. The next prime is 86357729. The reversal of 86357721 is 12775368.

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

It is not a de Polignac number, because 86357721 - 2⁹ = 86357209 is a prime.

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 86357721.

It is not an unprimeable number, because it can be changed into a prime (86357729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2685 + ... + 13413.

It is an arithmetic number, because the mean of its divisors is an integer number (14399660).

Almost surely, 2^86357721 is an apocalyptic number.

It is an amenable number.

86357721 is a deficient number, since it is larger than the sum of its proper divisors (28839559).

86357721 is a wasteful number, since it uses less digits than its factorization.

86357721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13415.

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

The square root of 86357721 is about 9292.8855045137. The cubic root of 86357721 is about 442.0116582717.

It can be divided in two parts, 86357 and 721, that added together give a palindrome (87078).

The spelling of 86357721 in words is "eighty-six million, three hundred fifty-seven thousand, seven hundred twenty-one".