1056621720 has 256 divisors, whose sum is σ = 3980897280. Its totient is φ = 217958400.

The previous prime is 1056621707. The next prime is 1056621779. The reversal of 1056621720 is 271266501.

It is a super-2 number, since 2×1056621720² = 2232898918351516800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1598190 + ... + 1598850.

It is an arithmetic number, because the mean of its divisors is an integer number (15550380).

Almost surely, 2^1056621720 is an apocalyptic number.

1056621720 is a gapful number since it is divisible by the number (10) 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 1056621720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1990448640).

1056621720 is an abundant number, since it is smaller than the sum of its proper divisors (2924275560).

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

1056621720 is a wasteful number, since it uses less digits than its factorization.

1056621720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1056621720 is about 32505.7182661759. The cubic root of 1056621720 is about 1018.5284817270.

The spelling of 1056621720 in words is "one billion, fifty-six million, six hundred twenty-one thousand, seven hundred twenty".