28371517440 has 816 divisors, whose sum is σ = 114755281920. Its totient is φ = 5945425920.

The previous prime is 28371517411. The next prime is 28371517463. The reversal of 28371517440 is 4471517382.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28371517392 and 28371517401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 915210225 + ... + 915210255.

Almost surely, 2^28371517440 is an apocalyptic number.

28371517440 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 28371517440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57377640960).

28371517440 is an abundant number, since it is smaller than the sum of its proper divisors (86383764480).

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

28371517440 is an equidigital number, since it uses as much as digits as its factorization.

28371517440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 28371517440 in words is "twenty-eight billion, three hundred seventy-one million, five hundred seventeen thousand, four hundred forty".