87356304721 has 9 divisors (see below), whose sum is σ = 101620965321. Its totient is φ = 74875059252.

The previous prime is 87356304691. The next prime is 87356304767. The reversal of 87356304721 is 12740365378.

It is a happy number.

The square root of 87356304721 is 295561.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 87356304721 - 2⁷ = 87356304593 is a prime.

It is a super-2 number, since 2×87356304721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87356302721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2047816 + ... + 2090038.

It is an arithmetic number, because the mean of its divisors is an integer number (11291218369).

Almost surely, 2^87356304721 is an apocalyptic number.

87356304721 is the 295561-st square number.

87356304721 is the 147781-st centered octagonal number.

It is an amenable number.

87356304721 is a deficient number, since it is larger than the sum of its proper divisors (14264660600).

87356304721 is an frugal number, since it uses more digits than its factorization.

87356304721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84460 (or 42230 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 87356304721 in words is "eighty-seven billion, three hundred fifty-six million, three hundred four thousand, seven hundred twenty-one".