28302191640 has 128 divisors (see below), whose sum is σ = 94830148800. Its totient is φ = 7508090880.

The previous prime is 28302191609. The next prime is 28302191641. The reversal of 28302191640 is 4619120382.

28302191640 is a `hidden beast` number, since 2 + 8 + 3 + 0 + 2 + 1 + 9 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28302191595 and 28302191604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28302191641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140550 + ... + 276330.

Almost surely, 2^28302191640 is an apocalyptic number.

28302191640 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 28302191640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47415074400).

28302191640 is an abundant number, since it is smaller than the sum of its proper divisors (66527957160).

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

28302191640 is a wasteful number, since it uses less digits than its factorization.

28302191640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135994 (or 135984 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 28302191640 in words is "twenty-eight billion, three hundred two million, one hundred ninety-one thousand, six hundred forty".