621612304 has 10 divisors (see below), whose sum is σ = 1204373870. Its totient is φ = 310806144.

The previous prime is 621612287. The next prime is 621612307. The reversal of 621612304 is 403216126.

It can be written as a sum of positive squares in only one way, i.e., 466560000 + 155052304 = 21600^2 + 12452^2 .

It is not an unprimeable number, because it can be changed into a prime (621612307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19425369 + ... + 19425400.

It is an arithmetic number, because the mean of its divisors is an integer number (120437387).

Almost surely, 2^621612304 is an apocalyptic number.

It is an amenable number.

621612304 is a deficient number, since it is larger than the sum of its proper divisors (582761566).

621612304 is a wasteful number, since it uses less digits than its factorization.

621612304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38850777 (or 38850771 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 621612304 is about 24932.1540184558. The cubic root of 621612304 is about 853.4404062150.

The spelling of 621612304 in words is "six hundred twenty-one million, six hundred twelve thousand, three hundred four".