621405076 has 24 divisors (see below), whose sum is σ = 1145168640. Its totient is φ = 294462432.

The previous prime is 621405049. The next prime is 621405133. The reversal of 621405076 is 670504126.

It is a happy number.

It is a super-2 number, since 2×621405076² = 772288536957131552, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 20956 + ... + 41011.

It is an arithmetic number, because the mean of its divisors is an integer number (47715360).

Almost surely, 2^621405076 is an apocalyptic number.

It is an amenable number.

621405076 is a deficient number, since it is larger than the sum of its proper divisors (523763564).

621405076 is a wasteful number, since it uses less digits than its factorization.

621405076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62103 (or 62101 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 621405076 is about 24927.9978337611. The cubic root of 621405076 is about 853.3455580253.

It can be divided in two parts, 6214050 and 76, that added together give a palindrome (6214126).

The spelling of 621405076 in words is "six hundred twenty-one million, four hundred five thousand, seventy-six".