28507290372 has 144 divisors (see below), whose sum is σ = 82292281344. Its totient is φ = 8241912000.

The previous prime is 28507290349. The next prime is 28507290373. The reversal of 28507290372 is 27309270582.

28507290372 is a `hidden beast` number, since 28 + 507 + 2 + 90 + 37 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (28507290373) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 855243 + ... + 887949.

It is an arithmetic number, because the mean of its divisors is an integer number (571474176).

Almost surely, 2^28507290372 is an apocalyptic number.

28507290372 is a gapful number since it is divisible by the number (22) 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 28507290372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41146140672).

28507290372 is an abundant number, since it is smaller than the sum of its proper divisors (53784990972).

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

28507290372 is a wasteful number, since it uses less digits than its factorization.

28507290372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32830 (or 32825 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 28507290372 in words is "twenty-eight billion, five hundred seven million, two hundred ninety thousand, three hundred seventy-two".