23661560 has 32 divisors (see below), whose sum is σ = 57335040. Its totient is φ = 8736384.

The previous prime is 23661559. The next prime is 23661577. The reversal of 23661560 is 6516632.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22232 + ... + 23271.

It is an arithmetic number, because the mean of its divisors is an integer number (1791720).

Almost surely, 2^23661560 is an apocalyptic number.

23661560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23661560 is an abundant number, since it is smaller than the sum of its proper divisors (33673480).

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

23661560 is a wasteful number, since it uses less digits than its factorization.

23661560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45527 (or 45523 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 23661560 is about 4864.3149569081. The cubic root of 23661560 is about 287.0876154455.

The spelling of 23661560 in words is "twenty-three million, six hundred sixty-one thousand, five hundred sixty".