57278491 has 8 divisors (see below), whose sum is σ = 61216560. Its totient is φ = 53403648.

The previous prime is 57278489. The next prime is 57278503. The reversal of 57278491 is 19487275.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57278491 - 2¹ = 57278489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57278401) 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, 13926 + ... + 17563.

It is an arithmetic number, because the mean of its divisors is an integer number (7652070).

Almost surely, 2^57278491 is an apocalyptic number.

57278491 is a deficient number, since it is larger than the sum of its proper divisors (3938069).

57278491 is a wasteful number, since it uses less digits than its factorization.

57278491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31613.

The product of its digits is 141120, while the sum is 43.

The square root of 57278491 is about 7568.2554793030. The cubic root of 57278491 is about 385.4758629283.

The spelling of 57278491 in words is "fifty-seven million, two hundred seventy-eight thousand, four hundred ninety-one".