6647632020 has 144 divisors (see below), whose sum is σ = 20591625600. Its totient is φ = 1735507200.

The previous prime is 6647632001. The next prime is 6647632037. The reversal of 6647632020 is 202367466.

It is a happy number.

6647632020 is a `hidden beast` number, since 6 + 647 + 6 + 3 + 2 + 0 + 2 + 0 = 666.

It is a super-2 number, since 2×6647632020² = 88382022946658560800, which contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 1902475 + ... + 1905965.

It is an arithmetic number, because the mean of its divisors is an integer number (142997400).

Almost surely, 2^6647632020 is an apocalyptic number.

6647632020 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 6647632020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10295812800).

6647632020 is an abundant number, since it is smaller than the sum of its proper divisors (13943993580).

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

6647632020 is a wasteful number, since it uses less digits than its factorization.

6647632020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726 (or 3721 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 6647632020 is about 81533.0118418301. The cubic root of 6647632020 is about 1880.2791214513.

Adding to 6647632020 its reverse (202367466), we get a palindrome (6849999486).

The spelling of 6647632020 in words is "six billion, six hundred forty-seven million, six hundred thirty-two thousand, twenty".