5621556864 has 256 divisors, whose sum is σ = 19220520960. Its totient is φ = 1412812800.

The previous prime is 5621556859. The next prime is 5621556887. The reversal of 5621556864 is 4686551265.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 913542 + ... + 919674.

It is an arithmetic number, because the mean of its divisors is an integer number (75080160).

Almost surely, 2^5621556864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5621556864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9610260480).

5621556864 is an abundant number, since it is smaller than the sum of its proper divisors (13598964096).

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

5621556864 is a wasteful number, since it uses less digits than its factorization.

5621556864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199 (or 6187 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The square root of 5621556864 is about 74977.0422462770. The cubic root of 5621556864 is about 1778.0837080359.

The spelling of 5621556864 in words is "five billion, six hundred twenty-one million, five hundred fifty-six thousand, eight hundred sixty-four".