57243990 has 16 divisors (see below), whose sum is σ = 137385648. Its totient is φ = 15265056.

The previous prime is 57243973. The next prime is 57243997. The reversal of 57243990 is 9934275.

It is a super-2 number, since 2×57243990² = 6553748782240200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57243997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954037 + ... + 954096.

It is an arithmetic number, because the mean of its divisors is an integer number (8586603).

Almost surely, 2^57243990 is an apocalyptic number.

57243990 is an abundant number, since it is smaller than the sum of its proper divisors (80141658).

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

57243990 is a wasteful number, since it uses less digits than its factorization.

57243990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908143.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 57243990 is about 7565.9758128083. The cubic root of 57243990 is about 385.3984518232.

The spelling of 57243990 in words is "fifty-seven million, two hundred forty-three thousand, nine hundred ninety".