23390043640 has 32 divisors (see below), whose sum is σ = 55723340880. Its totient is φ = 8805663232.

The previous prime is 23390043587. The next prime is 23390043667. The reversal of 23390043640 is 4634009332.

It is a super-2 number, since 2×23390043640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 23390043596 and 23390043605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17197882 + ... + 17199241.

Almost surely, 2^23390043640 is an apocalyptic number.

23390043640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23390043640 is an abundant number, since it is smaller than the sum of its proper divisors (32333297240).

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

23390043640 is a wasteful number, since it uses less digits than its factorization.

23390043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34397151 (or 34397147 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 34.

The spelling of 23390043640 in words is "twenty-three billion, three hundred ninety million, forty-three thousand, six hundred forty".