28722293440 has 56 divisors (see below), whose sum is σ = 68681315520. Its totient is φ = 11440816128.

The previous prime is 28722293417. The next prime is 28722293461. The reversal of 28722293440 is 4439222782.

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, 111297 + ... + 264256.

Almost surely, 2^28722293440 is an apocalyptic number.

28722293440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28722293440 is an abundant number, since it is smaller than the sum of its proper divisors (39959022080).

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

28722293440 is a wasteful number, since it uses less digits than its factorization.

28722293440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375809 (or 375799 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 28722293440 in words is "twenty-eight billion, seven hundred twenty-two million, two hundred ninety-three thousand, four hundred forty".