57278521 has 4 divisors (see below), whose sum is σ = 60293200. Its totient is φ = 54263844.

The previous prime is 57278503. The next prime is 57278561. The reversal of 57278521 is 12587275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57278521 - 2⁵ = 57278489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57278561) 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, 1507311 + ... + 1507348.

It is an arithmetic number, because the mean of its divisors is an integer number (15073300).

Almost surely, 2^57278521 is an apocalyptic number.

It is an amenable number.

57278521 is a deficient number, since it is larger than the sum of its proper divisors (3014679).

57278521 is a wasteful number, since it uses less digits than its factorization.

57278521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014678.

The product of its digits is 39200, while the sum is 37.

The square root of 57278521 is about 7568.2574612654. The cubic root of 57278521 is about 385.4759302269.

The spelling of 57278521 in words is "fifty-seven million, two hundred seventy-eight thousand, five hundred twenty-one".