89790721801 has 9 divisors (see below), whose sum is σ = 98699209959. Its totient is φ = 81624932400.

The previous prime is 89790721799. The next prime is 89790721817. The reversal of 89790721801 is 10812709798.

The square root of 89790721801 is 299651.

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

It can be written as a sum of positive squares in only one way, i.e., 89579891401 + 210830400 = 299299^2 + 14520^2 .

It is not a de Polignac number, because 89790721801 - 2¹ = 89790721799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89790421801) 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, 3282541 + ... + 3309781.

Almost surely, 2^89790721801 is an apocalyptic number.

89790721801 is the 299651-st square number.

89790721801 is the 149826-th centered octagonal number.

It is an amenable number.

89790721801 is a deficient number, since it is larger than the sum of its proper divisors (8908488158).

89790721801 is an frugal number, since it uses more digits than its factorization.

89790721801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54504 (or 27252 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 52.

The spelling of 89790721801 in words is "eighty-nine billion, seven hundred ninety million, seven hundred twenty-one thousand, eight hundred one".