28404764640 has 384 divisors, whose sum is σ = 114998123520. Its totient is φ = 6413727744.

The previous prime is 28404764561. The next prime is 28404764659. The reversal of 28404764640 is 4646740482.

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 63 ways as a sum of consecutive naturals, for example, 2504262 + ... + 2515578.

It is an arithmetic number, because the mean of its divisors is an integer number (299474280).

Almost surely, 2^28404764640 is an apocalyptic number.

28404764640 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 28404764640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57499061760).

28404764640 is an abundant number, since it is smaller than the sum of its proper divisors (86593358880).

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

28404764640 is a wasteful number, since it uses less digits than its factorization.

28404764640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11431 (or 11417 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 45.

The spelling of 28404764640 in words is "twenty-eight billion, four hundred four million, seven hundred sixty-four thousand, six hundred forty".