89871778645 has 32 divisors (see below), whose sum is σ = 118374359040. Its totient is φ = 64960200000.

The previous prime is 89871778639. The next prime is 89871778669. The reversal of 89871778645 is 54687717898.

It is not a de Polignac number, because 89871778645 - 2³ = 89871778637 is a prime.

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, 6605800 + ... + 6619390.

It is an arithmetic number, because the mean of its divisors is an integer number (3699198720).

Almost surely, 2^89871778645 is an apocalyptic number.

It is an amenable number.

89871778645 is a deficient number, since it is larger than the sum of its proper divisors (28502580395).

89871778645 is a wasteful number, since it uses less digits than its factorization.

89871778645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14337.

The product of its digits is 189665280, while the sum is 70.

The spelling of 89871778645 in words is "eighty-nine billion, eight hundred seventy-one million, seven hundred seventy-eight thousand, six hundred forty-five".