28640051904 has 112 divisors (see below), whose sum is σ = 79960988160. Its totient is φ = 9028884480.

The previous prime is 28640051897. The next prime is 28640051969. The reversal of 28640051904 is 40915004682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356589 + ... + 429459.

Almost surely, 2^28640051904 is an apocalyptic number.

28640051904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28640051904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39980494080).

28640051904 is an abundant number, since it is smaller than the sum of its proper divisors (51320936256).

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

28640051904 is a wasteful number, since it uses less digits than its factorization.

28640051904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72998 (or 72988 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 28640051904 in words is "twenty-eight billion, six hundred forty million, fifty-one thousand, nine hundred four".