57078021 has 64 divisors (see below), whose sum is σ = 103864320. Its totient is φ = 26922240.

The previous prime is 57078017. The next prime is 57078023. The reversal of 57078021 is 12087075.

It is a happy number.

57078021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57078021 - 2² = 57078017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57078021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57078023) 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 63 ways as a sum of consecutive naturals, for example, 249135 + ... + 249363.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^57078021 is an apocalyptic number.

It is an amenable number.

57078021 is a deficient number, since it is larger than the sum of its proper divisors (46786299).

57078021 is a wasteful number, since it uses less digits than its factorization.

57078021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 57078021 is about 7554.9997352746. Note that the first 3 decimals coincide. The cubic root of 57078021 is about 385.0256259999.

The spelling of 57078021 in words is "fifty-seven million, seventy-eight thousand, twenty-one".