28557742428 has 24 divisors (see below), whose sum is σ = 74038591760. Its totient is φ = 9519247440.

The previous prime is 28557742393. The next prime is 28557742439. The reversal of 28557742428 is 82424775582.

It is a happy number.

28557742428 is a `hidden beast` number, since 2 + 8 + 5 + 577 + 42 + 4 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132211663 + ... + 132211878.

Almost surely, 2^28557742428 is an apocalyptic number.

It is an amenable number.

28557742428 is an abundant number, since it is smaller than the sum of its proper divisors (45480849332).

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

28557742428 is a wasteful number, since it uses less digits than its factorization.

28557742428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264423554 (or 264423546 counting only the distinct ones).

The product of its digits is 10035200, while the sum is 54.

The spelling of 28557742428 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred forty-two thousand, four hundred twenty-eight".