621074745 has 12 divisors (see below), whose sum is σ = 1076529636. Its totient is φ = 331239840.

The previous prime is 621074743. The next prime is 621074749. The reversal of 621074745 is 547470126.

It can be written as a sum of positive squares in 2 ways, for example, as 440118441 + 180956304 = 20979^2 + 13452^2 .

It is not a de Polignac number, because 621074745 - 2¹ = 621074743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621074743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6900786 + ... + 6900875.

It is an arithmetic number, because the mean of its divisors is an integer number (89710803).

Almost surely, 2^621074745 is an apocalyptic number.

It is an amenable number.

621074745 is a deficient number, since it is larger than the sum of its proper divisors (455454891).

621074745 is a wasteful number, since it uses less digits than its factorization.

621074745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13801672 (or 13801669 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 621074745 is about 24921.3712503947. The cubic root of 621074745 is about 853.1943220247.

The spelling of 621074745 in words is "six hundred twenty-one million, seventy-four thousand, seven hundred forty-five".