57442836 has 72 divisors (see below), whose sum is σ = 150153696. Its totient is φ = 16950080.

The previous prime is 57442829. The next prime is 57442859. The reversal of 57442836 is 63824475.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 57442794 and 57442803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291490 + ... + 291686.

It is an arithmetic number, because the mean of its divisors is an integer number (2085468).

Almost surely, 2^57442836 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 57442836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75076848).

57442836 is an abundant number, since it is smaller than the sum of its proper divisors (92710860).

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

57442836 is a wasteful number, since it uses less digits than its factorization.

57442836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 260 counting only the distinct ones).

The product of its digits is 161280, while the sum is 39.

The square root of 57442836 is about 7579.1052242333. The cubic root of 57442836 is about 385.8441834880.

The spelling of 57442836 in words is "fifty-seven million, four hundred forty-two thousand, eight hundred thirty-six".