23621645 has 4 divisors (see below), whose sum is σ = 28345980. Its totient is φ = 18897312.

The previous prime is 23621639. The next prime is 23621657. The reversal of 23621645 is 54612632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2709316 + 20912329 = 1646^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 23621645 - 2⁶ = 23621581 is a prime.

It is a super-3 number, since 3×23621645³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2362160 + ... + 2362169.

It is an arithmetic number, because the mean of its divisors is an integer number (7086495).

Almost surely, 2^23621645 is an apocalyptic number.

It is an amenable number.

23621645 is a deficient number, since it is larger than the sum of its proper divisors (4724335).

23621645 is an equidigital number, since it uses as much as digits as its factorization.

23621645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724334.

The product of its digits is 8640, while the sum is 29.

The square root of 23621645 is about 4860.2103863928. The cubic root of 23621645 is about 286.9260939493.

The spelling of 23621645 in words is "twenty-three million, six hundred twenty-one thousand, six hundred forty-five".