28615991040 has 1008 divisors, whose sum is σ = 126860680128. Its totient is φ = 6019743744.

The previous prime is 28615991011. The next prime is 28615991059. The reversal of 28615991040 is 4019951682.

28615991040 is a `hidden beast` number, since 2 + 8 + 6 + 1 + 599 + 10 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 84913752 + ... + 84914088.

Almost surely, 2^28615991040 is an apocalyptic number.

28615991040 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 28615991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63430340064).

28615991040 is an abundant number, since it is smaller than the sum of its proper divisors (98244689088).

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

28615991040 is an equidigital number, since it uses as much as digits as its factorization.

28615991040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 28615991040 in words is "twenty-eight billion, six hundred fifteen million, nine hundred ninety-one thousand, forty".