6464156220 has 72 divisors (see below), whose sum is σ = 19669968864. Its totient is φ = 1718322048.

The previous prime is 6464156207. The next prime is 6464156243. The reversal of 6464156220 is 226514646.

6464156220 is a `hidden beast` number, since 6 + 4 + 641 + 5 + 6 + 2 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417 + ... + 113703.

It is an arithmetic number, because the mean of its divisors is an integer number (273194012).

Almost surely, 2^6464156220 is an apocalyptic number.

6464156220 is a gapful number since it is divisible by the number (60) 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 6464156220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9834984432).

6464156220 is an abundant number, since it is smaller than the sum of its proper divisors (13205812644).

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

6464156220 is a wasteful number, since it uses less digits than its factorization.

6464156220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113619 (or 113614 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 6464156220 is about 80399.9764925339. The cubic root of 6464156220 is about 1862.8188095606.

The spelling of 6464156220 in words is "six billion, four hundred sixty-four million, one hundred fifty-six thousand, two hundred twenty".