56155890 has 64 divisors (see below), whose sum is σ = 159356160. Its totient is φ = 12391680.

The previous prime is 56155873. The next prime is 56155943. The reversal of 56155890 is 9855165.

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, 1480 + ... + 10700.

It is an arithmetic number, because the mean of its divisors is an integer number (2489940).

Almost surely, 2^56155890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56155890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79678080).

56155890 is an abundant number, since it is smaller than the sum of its proper divisors (103200270).

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

56155890 is a wasteful number, since it uses less digits than its factorization.

56155890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9267.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 56155890 is about 7493.7233735974. The cubic root of 56155890 is about 382.9409157903.

The spelling of 56155890 in words is "fifty-six million, one hundred fifty-five thousand, eight hundred ninety".