57042390 has 16 divisors (see below), whose sum is σ = 136901808. Its totient is φ = 15211296.

The previous prime is 57042383. The next prime is 57042407. The reversal of 57042390 is 9324075.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1901413 = 57042390 / (5 + 7 + 0 + 4 + 2 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950677 + ... + 950736.

It is an arithmetic number, because the mean of its divisors is an integer number (8556363).

Almost surely, 2^57042390 is an apocalyptic number.

57042390 is an abundant number, since it is smaller than the sum of its proper divisors (79859418).

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

57042390 is a wasteful number, since it uses less digits than its factorization.

57042390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901423.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 57042390 is about 7552.6412598508. The cubic root of 57042390 is about 384.9454918052.

The spelling of 57042390 in words is "fifty-seven million, forty-two thousand, three hundred ninety".