621653532 has 24 divisors (see below), whose sum is σ = 1457035776. Its totient is φ = 206287728.

The previous prime is 621653531. The next prime is 621653573. The reversal of 621653532 is 235356126.

It is a super-2 number, since 2×621653532² = 772906227696150048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621653493 and 621653502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621653531) 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, 113478 + ... + 118829.

It is an arithmetic number, because the mean of its divisors is an integer number (60709824).

Almost surely, 2^621653532 is an apocalyptic number.

It is an amenable number.

621653532 is an abundant number, since it is smaller than the sum of its proper divisors (835382244).

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

621653532 is a wasteful number, since it uses less digits than its factorization.

621653532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232537 (or 232535 counting only the distinct ones).

The product of its digits is 32400, while the sum is 33.

The square root of 621653532 is about 24932.9808085596. The cubic root of 621653532 is about 853.4592737433.

The spelling of 621653532 in words is "six hundred twenty-one million, six hundred fifty-three thousand, five hundred thirty-two".