56542290 has 128 divisors (see below), whose sum is σ = 168099840. Its totient is φ = 11881728.

The previous prime is 56542279. The next prime is 56542307. The reversal of 56542290 is 9224565.

56542290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 147439 + ... + 147821.

It is an arithmetic number, because the mean of its divisors is an integer number (1313280).

Almost surely, 2^56542290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56542290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84049920).

56542290 is an abundant number, since it is smaller than the sum of its proper divisors (111557550).

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

56542290 is a wasteful number, since it uses less digits than its factorization.

56542290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 56542290 is about 7519.4607519423. The cubic root of 56542290 is about 383.8172280157.

The spelling of 56542290 in words is "fifty-six million, five hundred forty-two thousand, two hundred ninety".