57139740 has 144 divisors (see below), whose sum is σ = 200491200. Its totient is φ = 12902400.

The previous prime is 57139699. The next prime is 57139741. The reversal of 57139740 is 4793175.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 57139695 and 57139704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57139741) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 127036 + ... + 127484.

It is an arithmetic number, because the mean of its divisors is an integer number (1392300).

Almost surely, 2^57139740 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 57139740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100245600).

57139740 is an abundant number, since it is smaller than the sum of its proper divisors (143351460).

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

57139740 is a wasteful number, since it uses less digits than its factorization.

57139740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 57139740 is about 7559.0832777527. The cubic root of 57139740 is about 385.1643532843.

The spelling of 57139740 in words is "fifty-seven million, one hundred thirty-nine thousand, seven hundred forty".