57148739 has 4 divisors (see below), whose sum is σ = 57169056. Its totient is φ = 57128424.

The previous prime is 57148727. The next prime is 57148753. The reversal of 57148739 is 93784175.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57148739 - 2¹² = 57144643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57148739.

It is not an unprimeable number, because it can be changed into a prime (57148709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5099 + ... + 11844.

It is an arithmetic number, because the mean of its divisors is an integer number (14292264).

Almost surely, 2^57148739 is an apocalyptic number.

57148739 is a deficient number, since it is larger than the sum of its proper divisors (20317).

57148739 is a wasteful number, since it uses less digits than its factorization.

57148739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20316.

The product of its digits is 211680, while the sum is 44.

The square root of 57148739 is about 7559.6784984548. The cubic root of 57148739 is about 385.1845722077.

The spelling of 57148739 in words is "fifty-seven million, one hundred forty-eight thousand, seven hundred thirty-nine".