28378672322 has 270 divisors, whose sum is σ = 62787829419. Its totient is φ = 9605756160.

The previous prime is 28378672319. The next prime is 28378672331. The reversal of 28378672322 is 22327687382.

It can be written as a sum of positive squares in 5 ways, for example, as 11504922121 + 16873750201 = 107261^2 + 129899^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=119119.

Its product of digits (2709504) is a multiple of the sum of its prime factors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1669333658 + ... + 1669333674.

Almost surely, 2^28378672322 is an apocalyptic number.

28378672322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28378672322 is an abundant number, since it is smaller than the sum of its proper divisors (34409157097).

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

28378672322 is a wasteful number, since it uses less digits than its factorization.

28378672322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 50 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 50.

Multiplying 28378672322 by its sum of digits (50), we get a square (1418933616100 = 1191190²).

The spelling of 28378672322 in words is "twenty-eight billion, three hundred seventy-eight million, six hundred seventy-two thousand, three hundred twenty-two".