23147640 has 64 divisors (see below), whose sum is σ = 77162400. Its totient is φ = 6172416.

The previous prime is 23147639. The next prime is 23147651. The reversal of 23147640 is 4674132.

23147640 is a `hidden beast` number, since 2 + 3 + 14 + 7 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 15 ways as a sum of consecutive naturals, for example, 9637 + ... + 11796.

Almost surely, 2^23147640 is an apocalyptic number.

23147640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23147640 is an abundant number, since it is smaller than the sum of its proper divisors (54014760).

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

23147640 is a wasteful number, since it uses less digits than its factorization.

23147640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21453 (or 21443 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 23147640 is about 4811.1994346524. The cubic root of 23147640 is about 284.9939056869.

The spelling of 23147640 in words is "twenty-three million, one hundred forty-seven thousand, six hundred forty".