621304025 has 24 divisors (see below), whose sum is σ = 782038488. Its totient is φ = 489600000.

The previous prime is 621303997. The next prime is 621304027. The reversal of 621304025 is 520403126.

It can be written as a sum of positive squares in 12 ways, for example, as 2886601 + 618417424 = 1699^2 + 24868^2 .

It is not a de Polignac number, because 621304025 - 2¹² = 621299929 is a prime.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621304027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608015 + ... + 609035.

It is an arithmetic number, because the mean of its divisors is an integer number (32584937).

Almost surely, 2^621304025 is an apocalyptic number.

It is an amenable number.

621304025 is a deficient number, since it is larger than the sum of its proper divisors (160734463).

621304025 is a wasteful number, since it uses less digits than its factorization.

621304025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 621304025 is about 24925.9708938288. The cubic root of 621304025 is about 853.2992993662.

The spelling of 621304025 in words is "six hundred twenty-one million, three hundred four thousand, twenty-five".