57278981 has 8 divisors (see below), whose sum is σ = 58094400. Its totient is φ = 56469600.

The previous prime is 57278971. The next prime is 57278983. The reversal of 57278981 is 18987275.

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 57278981 - 2¹⁸ = 57016837 is a prime.

It is a super-2 number, since 2×57278981² = 6561763328796722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57278983) 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, 19625 + ... + 22353.

It is an arithmetic number, because the mean of its divisors is an integer number (7261800).

Almost surely, 2^57278981 is an apocalyptic number.

It is an amenable number.

57278981 is a deficient number, since it is larger than the sum of its proper divisors (815419).

57278981 is a wasteful number, since it uses less digits than its factorization.

57278981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019.

The product of its digits is 282240, while the sum is 47.

The square root of 57278981 is about 7568.2878512911. The cubic root of 57278981 is about 385.4769621346.

The spelling of 57278981 in words is "fifty-seven million, two hundred seventy-eight thousand, nine hundred eighty-one".