89640645 has 16 divisors (see below), whose sum is σ = 143664192. Its totient is φ = 47728640.

The previous prime is 89640611. The next prime is 89640667. The reversal of 89640645 is 54604698.

It is not a de Polignac number, because 89640645 - 2⁷ = 89640517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 89640597 and 89640606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4954 + ... + 14276.

It is an arithmetic number, because the mean of its divisors is an integer number (8979012).

Almost surely, 2^89640645 is an apocalyptic number.

It is an amenable number.

89640645 is a deficient number, since it is larger than the sum of its proper divisors (54023547).

89640645 is a wasteful number, since it uses less digits than its factorization.

89640645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9972.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 89640645 is about 9467.8743654529. The cubic root of 89640645 is about 447.5432289731.

The spelling of 89640645 in words is "eighty-nine million, six hundred forty thousand, six hundred forty-five".