621639432 has 48 divisors (see below), whose sum is σ = 1692943980. Its totient is φ = 206064000.

The previous prime is 621639419. The next prime is 621639439. The reversal of 621639432 is 234936126.

621639432 is a `hidden beast` number, since 6 + 216 + 3 + 9 + 432 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 539447076 + 82192356 = 23226^2 + 9066^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (621639439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10819 + ... + 36882.

Almost surely, 2^621639432 is an apocalyptic number.

It is an amenable number.

621639432 is an abundant number, since it is smaller than the sum of its proper divisors (1071304548).

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

621639432 is a wasteful number, since it uses less digits than its factorization.

621639432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47894 (or 47887 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 621639432 is about 24932.6980489477. The cubic root of 621639432 is about 853.4528211315.

The spelling of 621639432 in words is "six hundred twenty-one million, six hundred thirty-nine thousand, four hundred thirty-two".