57780828 has 72 divisors (see below), whose sum is σ = 171461472. Its totient is φ = 16060032.

The previous prime is 57780817. The next prime is 57780829. The reversal of 57780828 is 82808775.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57780829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6226 + ... + 12422.

Almost surely, 2^57780828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57780828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85730736).

57780828 is an abundant number, since it is smaller than the sum of its proper divisors (113680644).

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

57780828 is a wasteful number, since it uses less digits than its factorization.

57780828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6251 (or 6246 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 57780828 is about 7601.3701396525. The cubic root of 57780828 is about 386.5994694299.

The spelling of 57780828 in words is "fifty-seven million, seven hundred eighty thousand, eight hundred twenty-eight".