28252796440 has 64 divisors (see below), whose sum is σ = 71739108000. Its totient is φ = 9919472640.

The previous prime is 28252796437. The next prime is 28252796459. The reversal of 28252796440 is 4469725282.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1094325 + ... + 1119844.

Almost surely, 2^28252796440 is an apocalyptic number.

28252796440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28252796440 is an abundant number, since it is smaller than the sum of its proper divisors (43486311560).

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

28252796440 is a wasteful number, since it uses less digits than its factorization.

28252796440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214220 (or 2214216 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 28252796440 in words is "twenty-eight billion, two hundred fifty-two million, seven hundred ninety-six thousand, four hundred forty".