57978399 has 8 divisors (see below), whose sum is σ = 77355520. Its totient is φ = 38626776.

The previous prime is 57978353. The next prime is 57978409. The reversal of 57978399 is 99387975.

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

It is not a de Polignac number, because 57978399 - 2²¹ = 55881247 is a prime.

It is a super-2 number, since 2×57978399² = 6722989501206402, 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 (57979399) 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, 217 + ... + 10770.

It is an arithmetic number, because the mean of its divisors is an integer number (9669440).

Almost surely, 2^57978399 is an apocalyptic number.

57978399 is a deficient number, since it is larger than the sum of its proper divisors (19377121).

57978399 is a wasteful number, since it uses less digits than its factorization.

57978399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12749.

The product of its digits is 4286520, while the sum is 57.

The square root of 57978399 is about 7614.3547986681. The cubic root of 57978399 is about 387.0396036095.

It can be divided in two parts, 5797 and 8399, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 57978399 in words is "fifty-seven million, nine hundred seventy-eight thousand, three hundred ninety-nine".