621669825 has 72 divisors (see below), whose sum is σ = 1290219008. Its totient is φ = 280247040.

The previous prime is 621669809. The next prime is 621669827. The reversal of 621669825 is 528966126.

621669825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621669825 - 2⁴ = 621669809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621669827) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 112272 + ... + 117678.

Almost surely, 2^621669825 is an apocalyptic number.

It is an amenable number.

621669825 is an abundant number, since it is smaller than the sum of its proper divisors (668549183).

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

621669825 is a wasteful number, since it uses less digits than its factorization.

621669825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5503 (or 5495 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 621669825 is about 24933.3075423218. The cubic root of 621669825 is about 853.4667298206.

The spelling of 621669825 in words is "six hundred twenty-one million, six hundred sixty-nine thousand, eight hundred twenty-five".