6721632 has 36 divisors (see below), whose sum is σ = 19115460. Its totient is φ = 2240448.

The previous prime is 6721609. The next prime is 6721661. The reversal of 6721632 is 2361276.

It is a happy number.

6721632 is a `hidden beast` number, since 6 + 7 + 21 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 6721596 and 6721605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11382 + ... + 11957.

It is an arithmetic number, because the mean of its divisors is an integer number (530985).

Almost surely, 2^6721632 is an apocalyptic number.

It is an amenable number.

6721632 is an abundant number, since it is smaller than the sum of its proper divisors (12393828).

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

6721632 is a wasteful number, since it uses less digits than its factorization.

6721632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23355 (or 23344 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 6721632 is about 2592.6110390878. The cubic root of 6721632 is about 188.7230343186.

It can be divided in two parts, 672 and 1632, that added together give a square (2304 = 48²).

The spelling of 6721632 in words is "six million, seven hundred twenty-one thousand, six hundred thirty-two".