6620872 has 16 divisors (see below), whose sum is σ = 12954240. Its totient is φ = 3166416.

The previous prime is 6620869. The next prime is 6620899. The reversal of 6620872 is 2780266.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17808 + ... + 18175.

It is an arithmetic number, because the mean of its divisors is an integer number (809640).

Almost surely, 2^6620872 is an apocalyptic number.

It is an amenable number.

6620872 is a deficient number, since it is larger than the sum of its proper divisors (6333368).

6620872 is a wasteful number, since it uses less digits than its factorization.

6620872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36012 (or 36008 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6620872 is about 2573.1055166860. The cubic root of 6620872 is about 187.7752709330.

Subtracting from 6620872 its reverse (2780266), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 6620872 in words is "six million, six hundred twenty thousand, eight hundred seventy-two".