28109293434 has 40 divisors (see below), whose sum is σ = 63563528820. Its totient is φ = 9283797504.

The previous prime is 28109293423. The next prime is 28109293451. The reversal of 28109293434 is 43439290182.

28109293434 is a `hidden beast` number, since 28 + 109 + 2 + 93 + 434 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24962420025 + 3146873409 = 157995^2 + 56097^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28109293434.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 778279 + ... + 813594.

Almost surely, 2^28109293434 is an apocalyptic number.

28109293434 is an abundant number, since it is smaller than the sum of its proper divisors (35454235386).

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

28109293434 is a wasteful number, since it uses less digits than its factorization.

28109293434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591996 (or 1591987 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 28109293434 in words is "twenty-eight billion, one hundred nine million, two hundred ninety-three thousand, four hundred thirty-four".