6640624 has 10 divisors (see below), whose sum is σ = 12866240. Its totient is φ = 3320304.

The previous prime is 6640597. The next prime is 6640631. The reversal of 6640624 is 4260466.

It is a junction number, because it is equal to n+sod(n) for n = 6640592 and 6640601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207504 + ... + 207535.

It is an arithmetic number, because the mean of its divisors is an integer number (1286624).

Almost surely, 2^6640624 is an apocalyptic number.

It is an amenable number.

6640624 is a deficient number, since it is larger than the sum of its proper divisors (6225616).

6640624 is a wasteful number, since it uses less digits than its factorization.

6640624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415047 (or 415041 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 6640624 is about 2576.9408219825. The cubic root of 6640624 is about 187.9618150907.

It can be divided in two parts, 66406 and 24, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 6640624 in words is "six million, six hundred forty thousand, six hundred twenty-four".