57221779 has 4 divisors (see below), whose sum is σ = 60587784. Its totient is φ = 53855776.

The previous prime is 57221761. The next prime is 57221789. The reversal of 57221779 is 97712275.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57221779 - 2⁹ = 57221267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57221719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1682977 + ... + 1683010.

It is an arithmetic number, because the mean of its divisors is an integer number (15146946).

Almost surely, 2^57221779 is an apocalyptic number.

57221779 is a deficient number, since it is larger than the sum of its proper divisors (3366005).

57221779 is a wasteful number, since it uses less digits than its factorization.

57221779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366004.

The product of its digits is 61740, while the sum is 40.

The square root of 57221779 is about 7564.5078491598. The cubic root of 57221779 is about 385.3485997638.

The spelling of 57221779 in words is "fifty-seven million, two hundred twenty-one thousand, seven hundred seventy-nine".