28057728450 has 144 divisors (see below), whose sum is σ = 73895404320. Its totient is φ = 7025863680.

The previous prime is 28057728449. The next prime is 28057728467. The reversal of 28057728450 is 5482775082.

It is a super-2 number, since 2×28057728450² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28057728450.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 79483474 + ... + 79483826.

It is an arithmetic number, because the mean of its divisors is an integer number (513162530).

Almost surely, 2^28057728450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28057728450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36947702160).

28057728450 is an abundant number, since it is smaller than the sum of its proper divisors (45837675870).

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

28057728450 is a wasteful number, since it uses less digits than its factorization.

28057728450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 1254400, while the sum is 48.

The spelling of 28057728450 in words is "twenty-eight billion, fifty-seven million, seven hundred twenty-eight thousand, four hundred fifty".