6620406426 has 64 divisors (see below), whose sum is σ = 14823648000. Its totient is φ = 2190120768.

The previous prime is 6620406413. The next prime is 6620406487. The reversal of 6620406426 is 6246040266.

6620406426 is a `hidden beast` number, since 6 + 6 + 2 + 0 + 4 + 0 + 642 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8306260 + ... + 8307056.

It is an arithmetic number, because the mean of its divisors is an integer number (231619500).

Almost surely, 2^6620406426 is an apocalyptic number.

6620406426 is an abundant number, since it is smaller than the sum of its proper divisors (8203241574).

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

6620406426 is a wasteful number, since it uses less digits than its factorization.

6620406426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1774 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6620406426 is about 81365.8799866381. The cubic root of 6620406426 is about 1877.7086943157.

The spelling of 6620406426 in words is "six billion, six hundred twenty million, four hundred six thousand, four hundred twenty-six".