28247408640 has 840 divisors, whose sum is σ = 113459800608. Its totient is φ = 6688604160.

The previous prime is 28247408639. The next prime is 28247408663. The reversal of 28247408640 is 4680474282.

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 55 ways as a sum of consecutive naturals, for example, 656916459 + ... + 656916501.

Almost surely, 2^28247408640 is an apocalyptic number.

28247408640 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 28247408640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56729900304).

28247408640 is an abundant number, since it is smaller than the sum of its proper divisors (85212391968).

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

28247408640 is an frugal number, since it uses more digits than its factorization.

28247408640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 45.

The spelling of 28247408640 in words is "twenty-eight billion, two hundred forty-seven million, four hundred eight thousand, six hundred forty".