90670432640 has 64 divisors (see below), whose sum is σ = 220848878160. Its totient is φ = 35583854592.

The previous prime is 90670432597. The next prime is 90670432661. The reversal of 90670432640 is 4623407609.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×90670432640² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302614 + ... + 1370453.

Almost surely, 2^90670432640 is an apocalyptic number.

It is an amenable number.

90670432640 is an abundant number, since it is smaller than the sum of its proper divisors (130178445520).

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

90670432640 is a wasteful number, since it uses less digits than its factorization.

90670432640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673139 (or 2673127 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 90670432640 in words is "ninety billion, six hundred seventy million, four hundred thirty-two thousand, six hundred forty".