23991645 has 32 divisors (see below), whose sum is σ = 40372992. Its totient is φ = 12142592.

The previous prime is 23991631. The next prime is 23991677. The reversal of 23991645 is 54619932.

It is a cyclic number.

It is not a de Polignac number, because 23991645 - 2⁴ = 23991629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67789 + ... + 68141.

It is an arithmetic number, because the mean of its divisors is an integer number (1261656).

Almost surely, 2^23991645 is an apocalyptic number.

It is an amenable number.

23991645 is a deficient number, since it is larger than the sum of its proper divisors (16381347).

23991645 is a wasteful number, since it uses less digits than its factorization.

23991645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581.

The product of its digits is 58320, while the sum is 39.

The square root of 23991645 is about 4898.1266827227. The cubic root of 23991645 is about 288.4164379678.

The spelling of 23991645 in words is "twenty-three million, nine hundred ninety-one thousand, six hundred forty-five".