89772991 has 16 divisors (see below), whose sum is σ = 113465088. Its totient is φ = 68990400.

The previous prime is 89772959. The next prime is 89773007. The reversal of 89772991 is 19927798.

It is a cyclic number.

It is not a de Polignac number, because 89772991 - 2⁵ = 89772959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89772901) 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, 2365 + ... + 13606.

It is an arithmetic number, because the mean of its divisors is an integer number (7091568).

Almost surely, 2^89772991 is an apocalyptic number.

89772991 is a deficient number, since it is larger than the sum of its proper divisors (23692097).

89772991 is a wasteful number, since it uses less digits than its factorization.

89772991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16062.

The product of its digits is 571536, while the sum is 52.

The square root of 89772991 is about 9474.8610016190. The cubic root of 89772991 is about 447.7633725274.

The spelling of 89772991 in words is "eighty-nine million, seven hundred seventy-two thousand, nine hundred ninety-one".