28534778440 has 32 divisors (see below), whose sum is σ = 73375145280. Its totient is φ = 9783352512.

The previous prime is 28534778423. The next prime is 28534778453. The reversal of 28534778440 is 4487743582.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50954682 + ... + 50955241.

It is an arithmetic number, because the mean of its divisors is an integer number (2292973290).

Almost surely, 2^28534778440 is an apocalyptic number.

28534778440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28534778440 is an abundant number, since it is smaller than the sum of its proper divisors (44840366840).

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

28534778440 is a wasteful number, since it uses less digits than its factorization.

28534778440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101909941 (or 101909937 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 52.

The spelling of 28534778440 in words is "twenty-eight billion, five hundred thirty-four million, seven hundred seventy-eight thousand, four hundred forty".