621647632 has 10 divisors (see below), whose sum is σ = 1204442318. Its totient is φ = 310823808.

The previous prime is 621647597. The next prime is 621647639. The reversal of 621647632 is 236746126.

It can be written as a sum of positive squares in only one way, i.e., 583898896 + 37748736 = 24164^2 + 6144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 621647591 and 621647600.

It is not an unprimeable number, because it can be changed into a prime (621647639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19426473 + ... + 19426504.

Almost surely, 2^621647632 is an apocalyptic number.

It is an amenable number.

621647632 is a deficient number, since it is larger than the sum of its proper divisors (582794686).

621647632 is a wasteful number, since it uses less digits than its factorization.

621647632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38852985 (or 38852979 counting only the distinct ones).

The product of its digits is 72576, while the sum is 37.

The square root of 621647632 is about 24932.8624910980. The cubic root of 621647632 is about 853.4565737261.

It can be divided in two parts, 62164 and 7632, that added together give a palindrome (69796).

The spelling of 621647632 in words is "six hundred twenty-one million, six hundred forty-seven thousand, six hundred thirty-two".