28269337640 has 32 divisors (see below), whose sum is σ = 65157379560. Its totient is φ = 11031936000.

The previous prime is 28269337639. The next prime is 28269337693. The reversal of 28269337640 is 4673396282.

It can be written as a sum of positive squares in 4 ways, for example, as 21468696484 + 6800641156 = 146522^2 + 82466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8617061 + ... + 8620340.

Almost surely, 2^28269337640 is an apocalyptic number.

28269337640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28269337640 is an abundant number, since it is smaller than the sum of its proper divisors (36888041920).

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

28269337640 is a wasteful number, since it uses less digits than its factorization.

28269337640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17237453 (or 17237449 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 28269337640 in words is "twenty-eight billion, two hundred sixty-nine million, three hundred thirty-seven thousand, six hundred forty".