621061056 has 504 divisors, whose sum is σ = 2389063040. Its totient is φ = 150543360.

The previous prime is 621061043. The next prime is 621061073. The reversal of 621061056 is 650160126.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9269535 + ... + 9269601.

Almost surely, 2^621061056 is an apocalyptic number.

621061056 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621061056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1194531520).

621061056 is an abundant number, since it is smaller than the sum of its proper divisors (1768001984).

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

621061056 is a wasteful number, since it uses less digits than its factorization.

621061056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 621061056 is about 24921.0966050854. The cubic root of 621061056 is about 853.1880536096.

The spelling of 621061056 in words is "six hundred twenty-one million, sixty-one thousand, fifty-six".