23561987 has 8 divisors (see below), whose sum is σ = 24104640. Its totient is φ = 23025600.

The previous prime is 23561947. The next prime is 23561999. The reversal of 23561987 is 78916532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23561987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23561947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6503 + ... + 9455.

It is an arithmetic number, because the mean of its divisors is an integer number (3013080).

Almost surely, 2^23561987 is an apocalyptic number.

23561987 is a deficient number, since it is larger than the sum of its proper divisors (542653).

23561987 is a wasteful number, since it uses less digits than its factorization.

23561987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133.

The product of its digits is 90720, while the sum is 41.

The square root of 23561987 is about 4854.0691177609. The cubic root of 23561987 is about 286.6843401459.

The spelling of 23561987 in words is "twenty-three million, five hundred sixty-one thousand, nine hundred eighty-seven".