89491077720 has 512 divisors, whose sum is σ = 332758886400. Its totient is φ = 21476689920.

The previous prime is 89491077707. The next prime is 89491077721. The reversal of 89491077720 is 2777019498.

89491077720 is a `hidden beast` number, since 89 + 491 + 0 + 7 + 7 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89491077721) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 108737229 + ... + 108738051.

It is an arithmetic number, because the mean of its divisors is an integer number (649919700).

Almost surely, 2^89491077720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 89491077720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166379443200).

89491077720 is an abundant number, since it is smaller than the sum of its proper divisors (243267808680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

89491077720 is a wasteful number, since it uses less digits than its factorization.

89491077720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 89491077720 in words is "eighty-nine billion, four hundred ninety-one million, seventy-seven thousand, seven hundred twenty".