621981460 has 24 divisors (see below), whose sum is σ = 1319630760. Its totient is φ = 246226944.

The previous prime is 621981449. The next prime is 621981461. The reversal of 621981460 is 64189126.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27499536 + 594481924 = 5244^2 + 24382^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621981461) 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 7 ways as a sum of consecutive naturals, for example, 158365 + ... + 162244.

It is an arithmetic number, because the mean of its divisors is an integer number (54984615).

Almost surely, 2^621981460 is an apocalyptic number.

It is an amenable number.

621981460 is an abundant number, since it is smaller than the sum of its proper divisors (697649300).

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

621981460 is a wasteful number, since it uses less digits than its factorization.

621981460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320715 (or 320713 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 621981460 is about 24939.5561307735. The cubic root of 621981460 is about 853.6093165891.

It can be divided in two parts, 621 and 981460, that added together give a square (982081 = 991²).

The spelling of 621981460 in words is "six hundred twenty-one million, nine hundred eighty-one thousand, four hundred sixty".