3724636621 has 4 divisors (see below), whose sum is σ = 3771784000. Its totient is φ = 3677489244.

The previous prime is 3724636613. The next prime is 3724636627. The reversal of 3724636621 is 1266364273.

3724636621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1266364273 = 25247 ⋅50159.

It is a cyclic number.

It is not a de Polignac number, because 3724636621 - 2³ = 3724636613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3724636627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23573571 + ... + 23573728.

It is an arithmetic number, because the mean of its divisors is an integer number (942946000).

Almost surely, 2^3724636621 is an apocalyptic number.

It is an amenable number.

3724636621 is a deficient number, since it is larger than the sum of its proper divisors (47147379).

3724636621 is an equidigital number, since it uses as much as digits as its factorization.

3724636621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47147378.

The product of its digits is 217728, while the sum is 40.

The square root of 3724636621 is about 61029.8010893039. The cubic root of 3724636621 is about 1550.1056634176.

The spelling of 3724636621 in words is "three billion, seven hundred twenty-four million, six hundred thirty-six thousand, six hundred twenty-one".