56161440 has 144 divisors (see below), whose sum is σ = 196324128. Its totient is φ = 14611968.

The previous prime is 56161433. The next prime is 56161447. The reversal of 56161440 is 4416165.

56161440 is a `hidden beast` number, since 5 + 6 + 1 + 614 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (56161433) and next prime (56161447).

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (56161447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61467 + ... + 62373.

It is an arithmetic number, because the mean of its divisors is an integer number (1363362).

Almost surely, 2^56161440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56161440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98162064).

56161440 is an abundant number, since it is smaller than the sum of its proper divisors (140162688).

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

56161440 is a wasteful number, since it uses less digits than its factorization.

56161440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971 (or 960 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 56161440 is about 7494.0936743545. The cubic root of 56161440 is about 382.9535309827.

It can be divided in two parts, 5616 and 1440, that added together give a square (7056 = 84²).

The spelling of 56161440 in words is "fifty-six million, one hundred sixty-one thousand, four hundred forty".