621733172 has 6 divisors (see below), whose sum is σ = 1088033058. Its totient is φ = 310866584.

The previous prime is 621733159. The next prime is 621733183. The reversal of 621733172 is 271337126.

It can be written as a sum of positive squares in only one way, i.e., 614742436 + 6990736 = 24794^2 + 2644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77716643 + ... + 77716650.

It is an arithmetic number, because the mean of its divisors is an integer number (181338843).

Almost surely, 2^621733172 is an apocalyptic number.

It is an amenable number.

621733172 is a deficient number, since it is larger than the sum of its proper divisors (466299886).

621733172 is a wasteful number, since it uses less digits than its factorization.

621733172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155433297 (or 155433295 counting only the distinct ones).

The product of its digits is 10584, while the sum is 32.

The square root of 621733172 is about 24934.5778388165. The cubic root of 621733172 is about 853.4957177273.

The spelling of 621733172 in words is "six hundred twenty-one million, seven hundred thirty-three thousand, one hundred seventy-two".