57280305 has 8 divisors (see below), whose sum is σ = 91648512. Its totient is φ = 30549488.

The previous prime is 57280297. The next prime is 57280309. The reversal of 57280305 is 50308275.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 57280305 - 2³ = 57280297 is a prime.

It is a super-3 number, since 3×57280305³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (57280309) 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, 1909329 + ... + 1909358.

It is an arithmetic number, because the mean of its divisors is an integer number (11456064).

Almost surely, 2^57280305 is an apocalyptic number.

It is an amenable number.

57280305 is a deficient number, since it is larger than the sum of its proper divisors (34368207).

57280305 is a wasteful number, since it uses less digits than its factorization.

57280305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818695.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 57280305 is about 7568.3753210316. The cubic root of 57280305 is about 385.4799322036.

The spelling of 57280305 in words is "fifty-seven million, two hundred eighty thousand, three hundred five".