28784382840 has 96 divisors (see below), whose sum is σ = 94034182320. Its totient is φ = 7636045824.

The previous prime is 28784382791. The next prime is 28784382857. The reversal of 28784382840 is 4828348782.

28784382840 is a `hidden beast` number, since 287 + 84 + 3 + 8 + 284 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137662 + ... + 276621.

Almost surely, 2^28784382840 is an apocalyptic number.

28784382840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28784382840 is an abundant number, since it is smaller than the sum of its proper divisors (65249799480).

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

28784382840 is a wasteful number, since it uses less digits than its factorization.

28784382840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414493 (or 414486 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 54.

The spelling of 28784382840 in words is "twenty-eight billion, seven hundred eighty-four million, three hundred eighty-two thousand, eight hundred forty".