6620642428 has 12 divisors (see below), whose sum is σ = 11688657120. Its totient is φ = 3281026112.

The previous prime is 6620642417. The next prime is 6620642467. The reversal of 6620642428 is 8242460266.

It is a congruent 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, 7323268 + ... + 7324171.

It is an arithmetic number, because the mean of its divisors is an integer number (974054760).

Almost surely, 2^6620642428 is an apocalyptic number.

It is an amenable number.

6620642428 is a deficient number, since it is larger than the sum of its proper divisors (5068014692).

6620642428 is a wasteful number, since it uses less digits than its factorization.

6620642428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14647556 (or 14647554 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 6620642428 is about 81367.3302253429. The cubic root of 6620642428 is about 1877.7310060246.

The spelling of 6620642428 in words is "six billion, six hundred twenty million, six hundred forty-two thousand, four hundred twenty-eight".