57639438 has 20 divisors (see below), whose sum is σ = 129155400. Its totient is φ = 19213092.

The previous prime is 57639409. The next prime is 57639473. The reversal of 57639438 is 83493675.

57639438 is a `hidden beast` number, since 5 + 7 + 639 + 4 + 3 + 8 = 666.

57639438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 57639393 and 57639402.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 177738 + ... + 178061.

It is an arithmetic number, because the mean of its divisors is an integer number (6457770).

Almost surely, 2^57639438 is an apocalyptic number.

57639438 is an abundant number, since it is smaller than the sum of its proper divisors (71515962).

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

57639438 is a wasteful number, since it uses less digits than its factorization.

57639438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355813 (or 355804 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 57639438 is about 7592.0641461990. The cubic root of 57639438 is about 386.2838748686.

The spelling of 57639438 in words is "fifty-seven million, six hundred thirty-nine thousand, four hundred thirty-eight".