28013051640 has 128 divisors (see below), whose sum is σ = 96167554560. Its totient is φ = 6394796544.

The previous prime is 28013051617. The next prime is 28013051669. The reversal of 28013051640 is 4615031082.

It is a Cunningham number, because it is equal to 167371²-1.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28013051598 and 28013051607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 648559 + ... + 690401.

It is an arithmetic number, because the mean of its divisors is an integer number (751309020).

Almost surely, 2^28013051640 is an apocalyptic number.

28013051640 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 28013051640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48083777280).

28013051640 is an abundant number, since it is smaller than the sum of its proper divisors (68154502920).

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

28013051640 is a wasteful number, since it uses less digits than its factorization.

28013051640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42661 (or 42657 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 28013051640 in words is "twenty-eight billion, thirteen million, fifty-one thousand, six hundred forty".