57187890 has 64 divisors (see below), whose sum is σ = 159148800. Its totient is φ = 14585472.

The previous prime is 57187843. The next prime is 57187909. The reversal of 57187890 is 9878175.

57187890 is a `hidden beast` number, since 571 + 8 + 78 + 9 + 0 = 666.

57187890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 1606 + ... + 10814.

It is an arithmetic number, because the mean of its divisors is an integer number (2486700).

Almost surely, 2^57187890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57187890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79574400).

57187890 is an abundant number, since it is smaller than the sum of its proper divisors (101960910).

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

57187890 is a wasteful number, since it uses less digits than its factorization.

57187890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248 (or 9242 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 57187890 is about 7562.2675170877. The cubic root of 57187890 is about 385.2725118487.

The spelling of 57187890 in words is "fifty-seven million, one hundred eighty-seven thousand, eight hundred ninety".