621400616 has 16 divisors (see below), whose sum is σ = 1165393440. Its totient is φ = 310629040.

The previous prime is 621400613. The next prime is 621400621. The reversal of 621400616 is 616004126.

It is a happy number.

It is a super-2 number, since 2×621400616² = 772277451130358912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (621400613) by changing a digit.

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, 55751 + ... + 65961.

It is an arithmetic number, because the mean of its divisors is an integer number (72837090).

Almost surely, 2^621400616 is an apocalyptic number.

It is an amenable number.

621400616 is a deficient number, since it is larger than the sum of its proper divisors (543992824).

621400616 is a wasteful number, since it uses less digits than its factorization.

621400616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17824 (or 17820 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 621400616 is about 24927.9083759549. The cubic root of 621400616 is about 853.3435164529.

The spelling of 621400616 in words is "six hundred twenty-one million, four hundred thousand, six hundred sixteen".