28405451628 has 120 divisors (see below), whose sum is σ = 80158589280. Its totient is φ = 8744440320.

The previous prime is 28405451609. The next prime is 28405451639. The reversal of 28405451628 is 82615450482.

28405451628 is a `hidden beast` number, since 2 + 8 + 40 + 545 + 1 + 62 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 150388 + ... + 281828.

It is an arithmetic number, because the mean of its divisors is an integer number (667988244).

Almost surely, 2^28405451628 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 28405451628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40079294640).

28405451628 is an abundant number, since it is smaller than the sum of its proper divisors (51753137652).

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

28405451628 is a wasteful number, since it uses less digits than its factorization.

28405451628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131509 (or 131498 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 45.

The spelling of 28405451628 in words is "twenty-eight billion, four hundred five million, four hundred fifty-one thousand, six hundred twenty-eight".