87346721 has 16 divisors (see below), whose sum is σ = 109330560. Its totient is φ = 67793280.

The previous prime is 87346639. The next prime is 87346723. The reversal of 87346721 is 12764378.

It is a cyclic number.

It is not a de Polignac number, because 87346721 - 2¹⁴ = 87330337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87346723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18605 + ... + 22821.

It is an arithmetic number, because the mean of its divisors is an integer number (6833160).

Almost surely, 2^87346721 is an apocalyptic number.

It is an amenable number.

87346721 is a deficient number, since it is larger than the sum of its proper divisors (21983839).

87346721 is a wasteful number, since it uses less digits than its factorization.

87346721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4504.

The product of its digits is 56448, while the sum is 38.

The square root of 87346721 is about 9345.9467685195. The cubic root of 87346721 is about 443.6926169005.

The spelling of 87346721 in words is "eighty-seven million, three hundred forty-six thousand, seven hundred twenty-one".