57478021 has 4 divisors (see below), whose sum is σ = 60503200. Its totient is φ = 54452844.

The previous prime is 57478019. The next prime is 57478033. The reversal of 57478021 is 12087475.

It is a happy number.

57478021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 57478021 - 2¹ = 57478019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57478051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512561 + ... + 1512598.

It is an arithmetic number, because the mean of its divisors is an integer number (15125800).

Almost surely, 2^57478021 is an apocalyptic number.

It is an amenable number.

57478021 is a deficient number, since it is larger than the sum of its proper divisors (3025179).

57478021 is a wasteful number, since it uses less digits than its factorization.

57478021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025178.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 57478021 is about 7581.4260531908. The cubic root of 57478021 is about 385.9229467574.

The spelling of 57478021 in words is "fifty-seven million, four hundred seventy-eight thousand, twenty-one".