56172788890 has 8 divisors (see below), whose sum is σ = 101111020020. Its totient is φ = 22469115552.

The previous prime is 56172788863. The next prime is 56172788897. The reversal of 56172788890 is 9888727165.

It can be written as a sum of positive squares in 2 ways, for example, as 51450487929 + 4722300961 = 226827^2 + 68719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×56172788890⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (56172788897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808639435 + ... + 2808639454.

Almost surely, 2^56172788890 is an apocalyptic number.

56172788890 is a deficient number, since it is larger than the sum of its proper divisors (44938231130).

56172788890 is a wasteful number, since it uses less digits than its factorization.

56172788890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5617278896.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 56172788890 in words is "fifty-six billion, one hundred seventy-two million, seven hundred eighty-eight thousand, eight hundred ninety".