1620636252 has 24 divisors (see below), whose sum is σ = 3782297232. Its totient is φ = 540096000.

The previous prime is 1620636211. The next prime is 1620636253. The reversal of 1620636252 is 2526360261.

It is a super-2 number, since 2×1620636252² = 5252923722593215008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620636253) 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, 58252 + ... + 81452.

It is an arithmetic number, because the mean of its divisors is an integer number (157595718).

Almost surely, 2^1620636252 is an apocalyptic number.

1620636252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620636252 is an abundant number, since it is smaller than the sum of its proper divisors (2161660980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620636252 is a wasteful number, since it uses less digits than its factorization.

1620636252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29029 (or 29027 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1620636252 is about 40257.1267231033. The cubic root of 1620636252 is about 1174.6140279276.

The spelling of 1620636252 in words is "one billion, six hundred twenty million, six hundred thirty-six thousand, two hundred fifty-two".