6635972 has 18 divisors (see below), whose sum is σ = 13509342. Its totient is φ = 2843904.

The previous prime is 6635963. The next prime is 6636011. The reversal of 6635972 is 2795366.

It can be written as a sum of positive squares in only one way, i.e., 6635776 + 196 = 2576^2 + 14^2 .

It is a super-2 number, since 2×6635972² = 88072248769568, which contains 22 as substring.

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, 16733 + ... + 17124.

It is an arithmetic number, because the mean of its divisors is an integer number (750519).

Almost surely, 2^6635972 is an apocalyptic number.

It is an amenable number.

6635972 is an abundant number, since it is smaller than the sum of its proper divisors (6873370).

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

6635972 is a wasteful number, since it uses less digits than its factorization.

6635972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33875 (or 33866 counting only the distinct ones).

The product of its digits is 68040, while the sum is 38.

The square root of 6635972 is about 2576.0380431973. The cubic root of 6635972 is about 187.9179134621.

Subtracting from 6635972 its reverse (2795366), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 6635972 in words is "six million, six hundred thirty-five thousand, nine hundred seventy-two".