23661490 has 16 divisors (see below), whose sum is σ = 43175448. Its totient is φ = 9334656.

The previous prime is 23661487. The next prime is 23661499. The reversal of 23661490 is 9416632.

It can be written as a sum of positive squares in 4 ways, for example, as 22838841 + 822649 = 4779^2 + 907^2 .

It is a super-2 number, since 2×23661490² = 1119732218040200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23661499) 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, 15477 + ... + 16936.

Almost surely, 2^23661490 is an apocalyptic number.

23661490 is a deficient number, since it is larger than the sum of its proper divisors (19513958).

23661490 is a wasteful number, since it uses less digits than its factorization.

23661490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32493.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 23661490 is about 4864.3077616450. The cubic root of 23661490 is about 287.0873323400.

The spelling of 23661490 in words is "twenty-three million, six hundred sixty-one thousand, four hundred ninety".