56172906 has 48 divisors (see below), whose sum is σ = 127187520. Its totient is φ = 18376200.

The previous prime is 56172889. The next prime is 56172917. The reversal of 56172906 is 60927165.

56172906 is a `hidden beast` number, since 561 + 7 + 2 + 90 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371931 + ... + 372081.

It is an arithmetic number, because the mean of its divisors is an integer number (2649740).

Almost surely, 2^56172906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56172906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63593760).

56172906 is an abundant number, since it is smaller than the sum of its proper divisors (71014614).

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

56172906 is a wasteful number, since it uses less digits than its factorization.

56172906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 56172906 is about 7494.8586377596. The cubic root of 56172906 is about 382.9795906564.

The spelling of 56172906 in words is "fifty-six million, one hundred seventy-two thousand, nine hundred six".