621728984 has 16 divisors (see below), whose sum is σ = 1166162400. Its totient is φ = 310752352.

The previous prime is 621728983. The next prime is 621729029. The reversal of 621728984 is 489827126.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621728983) 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, 12494 + ... + 37410.

It is an arithmetic number, because the mean of its divisors is an integer number (72885150).

Almost surely, 2^621728984 is an apocalyptic number.

It is an amenable number.

621728984 is a deficient number, since it is larger than the sum of its proper divisors (544433416).

621728984 is a wasteful number, since it uses less digits than its factorization.

621728984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28042 (or 28038 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 621728984 is about 24934.4938589096. The cubic root of 621728984 is about 853.4938013382.

The spelling of 621728984 in words is "six hundred twenty-one million, seven hundred twenty-eight thousand, nine hundred eighty-four".