89979191520820 has 96 divisors (see below), whose sum is σ = 217545781275648. Its totient is φ = 30622088558592.

The previous prime is 89979191520731. The next prime is 89979191520853. The reversal of 89979191520820 is 2802519197998.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 89979191520820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220423624 + ... + 220831456.

It is an arithmetic number, because the mean of its divisors is an integer number (2266101888288).

Almost surely, 2^{89979191520820} 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 89979191520820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108772890637824).

89979191520820 is an abundant number, since it is smaller than the sum of its proper divisors (127566589754828).

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

89979191520820 is a wasteful number, since it uses less digits than its factorization.

89979191520820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419489 (or 419487 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 70.

The spelling of 89979191520820 in words is "eighty-nine trillion, nine hundred seventy-nine billion, one hundred ninety-one million, five hundred twenty thousand, eight hundred twenty".