57309028 has 18 divisors (see below), whose sum is σ = 116665206. Its totient is φ = 24560928.

The previous prime is 57309019. The next prime is 57309037. The reversal of 57309028 is 82090375.

It is an interprime number because it is at equal distance from previous prime (57309019) and next prime (57309037).

It can be written as a sum of positive squares in only one way, i.e., 50381604 + 6927424 = 7098^2 + 2632^2 .

It is a junction number, because it is equal to n+sod(n) for n = 57308984 and 57309002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146001 + ... + 146392.

Almost surely, 2^57309028 is an apocalyptic number.

It is an amenable number.

57309028 is an abundant number, since it is smaller than the sum of its proper divisors (59356178).

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

57309028 is a wasteful number, since it uses less digits than its factorization.

57309028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292411 (or 292402 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 57309028 is about 7570.2726503079. The cubic root of 57309028 is about 385.5443539387.

The spelling of 57309028 in words is "fifty-seven million, three hundred nine thousand, twenty-eight".