28137091840 has 288 divisors, whose sum is σ = 79587277056. Its totient is φ = 9396142080.

The previous prime is 28137091831. The next prime is 28137091897. The reversal of 28137091840 is 4819073182.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63514659 + ... + 63515101.

It is an arithmetic number, because the mean of its divisors is an integer number (276344712).

Almost surely, 2^28137091840 is an apocalyptic number.

28137091840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28137091840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39793638528).

28137091840 is an abundant number, since it is smaller than the sum of its proper divisors (51450185216).

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

28137091840 is a wasteful number, since it uses less digits than its factorization.

28137091840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 28137091840 in words is "twenty-eight billion, one hundred thirty-seven million, ninety-one thousand, eight hundred forty".