57215478 has 16 divisors (see below), whose sum is σ = 114505776. Its totient is φ = 19059360.

The previous prime is 57215453. The next prime is 57215503. The reversal of 57215478 is 87451275.

It is an interprime number because it is at equal distance from previous prime (57215453) and next prime (57215503).

It is a super-2 number, since 2×57215478² = 6547221845536968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14388 + ... + 17928.

It is an arithmetic number, because the mean of its divisors is an integer number (7156611).

Almost surely, 2^57215478 is an apocalyptic number.

57215478 is an abundant number, since it is smaller than the sum of its proper divisors (57290298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57215478 is a wasteful number, since it uses less digits than its factorization.

57215478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6239.

The product of its digits is 78400, while the sum is 39.

The square root of 57215478 is about 7564.0913532294. The cubic root of 57215478 is about 385.3344549708.

The spelling of 57215478 in words is "fifty-seven million, two hundred fifteen thousand, four hundred seventy-eight".