28557201840 has 80 divisors (see below), whose sum is σ = 88592457696. Its totient is φ = 7609651200.

The previous prime is 28557201781. The next prime is 28557201853. The reversal of 28557201840 is 4810275582.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 28557201792 and 28557201801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288360 + ... + 374520.

Almost surely, 2^28557201840 is an apocalyptic number.

28557201840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28557201840 is an abundant number, since it is smaller than the sum of its proper divisors (60035255856).

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

28557201840 is a wasteful number, since it uses less digits than its factorization.

28557201840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87558 (or 87552 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The spelling of 28557201840 in words is "twenty-eight billion, five hundred fifty-seven million, two hundred one thousand, eight hundred forty".