621288680 has 16 divisors (see below), whose sum is σ = 1397899620. Its totient is φ = 248515456.

The previous prime is 621288677. The next prime is 621288713. The reversal of 621288680 is 86882126.

It can be written as a sum of positive squares in 2 ways, for example, as 619910404 + 1378276 = 24898^2 + 1174^2 .

It is a super-2 number, since 2×621288680² = 771999247792284800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7766069 + ... + 7766148.

Almost surely, 2^621288680 is an apocalyptic number.

It is an amenable number.

621288680 is an abundant number, since it is smaller than the sum of its proper divisors (776610940).

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

621288680 is a wasteful number, since it uses less digits than its factorization.

621288680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15532228 (or 15532224 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 621288680 is about 24925.6630804478. The cubic root of 621288680 is about 853.2922743645.

The spelling of 621288680 in words is "six hundred twenty-one million, two hundred eighty-eight thousand, six hundred eighty".