28136991744 has 66 divisors (see below), whose sum is σ = 81244979660. Its totient is φ = 9378994176.

The previous prime is 28136991689. The next prime is 28136991749. The reversal of 28136991744 is 44719963182.

It is not an unprimeable number, because it can be changed into a prime (28136991749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1517314 + ... + 1535745.

Almost surely, 2^28136991744 is an apocalyptic number.

28136991744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28136991744 is an abundant number, since it is smaller than the sum of its proper divisors (53107987916).

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

28136991744 is a wasteful number, since it uses less digits than its factorization.

28136991744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053085 (or 3053064 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 28136991744 in words is "twenty-eight billion, one hundred thirty-six million, nine hundred ninety-one thousand, seven hundred forty-four".