28513194864 has 640 divisors, whose sum is σ = 99636480000. Its totient is φ = 6954393600.

The previous prime is 28513194863. The next prime is 28513194907. The reversal of 28513194864 is 46849131582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513194863) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 320372932 + ... + 320373020.

It is an arithmetic number, because the mean of its divisors is an integer number (155682000).

Almost surely, 2^28513194864 is an apocalyptic number.

28513194864 is a gapful number since it is divisible by the number (24) 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 28513194864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49818240000).

28513194864 is an abundant number, since it is smaller than the sum of its proper divisors (71123285136).

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

28513194864 is a wasteful number, since it uses less digits than its factorization.

28513194864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 202 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The spelling of 28513194864 in words is "twenty-eight billion, five hundred thirteen million, one hundred ninety-four thousand, eight hundred sixty-four".