89736792721 has 9 divisors (see below), whose sum is σ = 90070239081. Its totient is φ = 89404579572.

The previous prime is 89736792703. The next prime is 89736792757. The reversal of 89736792721 is 12729763798.

The square root of 89736792721 is 299561.

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

It is not a de Polignac number, because 89736792721 - 2¹⁵ = 89736759953 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 89736792721.

It is not an unprimeable number, because it can be changed into a prime (89736792791) 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, 138696420 + ... + 138697066.

Almost surely, 2^89736792721 is an apocalyptic number.

89736792721 is the 299561-st square number.

89736792721 is the 149781-st centered octagonal number.

It is an amenable number.

89736792721 is a deficient number, since it is larger than the sum of its proper divisors (333446360).

89736792721 is an frugal number, since it uses more digits than its factorization.

89736792721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220 (or 1110 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 61.

The spelling of 89736792721 in words is "eighty-nine billion, seven hundred thirty-six million, seven hundred ninety-two thousand, seven hundred twenty-one".