28036923640 has 256 divisors, whose sum is σ = 77370163200. Its totient is φ = 9021196800.

The previous prime is 28036923637. The next prime is 28036923667. The reversal of 28036923640 is 4632963082.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 8266345 + ... + 8269735.

It is an arithmetic number, because the mean of its divisors is an integer number (302227200).

Almost surely, 2^28036923640 is an apocalyptic number.

28036923640 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 28036923640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38685081600).

28036923640 is an abundant number, since it is smaller than the sum of its proper divisors (49333239560).

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

28036923640 is a wasteful number, since it uses less digits than its factorization.

28036923640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498 (or 3494 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 28036923640 in words is "twenty-eight billion, thirty-six million, nine hundred twenty-three thousand, six hundred forty".