621453745 has 32 divisors (see below), whose sum is σ = 851457024. Its totient is φ = 431308800.

The previous prime is 621453727. The next prime is 621453757. The reversal of 621453745 is 547354126.

It is not a de Polignac number, because 621453745 - 2⁷ = 621453617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121969 + ... + 126961.

It is an arithmetic number, because the mean of its divisors is an integer number (26608032).

Almost surely, 2^621453745 is an apocalyptic number.

It is an amenable number.

621453745 is a deficient number, since it is larger than the sum of its proper divisors (230003279).

621453745 is a wasteful number, since it uses less digits than its factorization.

621453745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113.

The product of its digits is 100800, while the sum is 37.

The square root of 621453745 is about 24928.9740061640. The cubic root of 621453745 is about 853.3678357055.

The spelling of 621453745 in words is "six hundred twenty-one million, four hundred fifty-three thousand, seven hundred forty-five".