28778351832 has 24 divisors (see below), whose sum is σ = 77941369740. Its totient is φ = 9592783920.

The previous prime is 28778351827. The next prime is 28778351837. The reversal of 28778351832 is 23815387782.

28778351832 is a `hidden beast` number, since 28 + 7 + 78 + 3 + 518 + 32 = 666.

It is an interprime number because it is at equal distance from previous prime (28778351827) and next prime (28778351837).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778351837) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199849594 + ... + 199849737.

Almost surely, 2^28778351832 is an apocalyptic number.

It is an amenable number.

28778351832 is an abundant number, since it is smaller than the sum of its proper divisors (49163017908).

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

28778351832 is a wasteful number, since it uses less digits than its factorization.

28778351832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399699343 (or 399699336 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 28778351832 in words is "twenty-eight billion, seven hundred seventy-eight million, three hundred fifty-one thousand, eight hundred thirty-two".