28207559772 has 96 divisors (see below), whose sum is σ = 83638732800. Its totient is φ = 8053442496.

The previous prime is 28207559767. The next prime is 28207559819. The reversal of 28207559772 is 27795570282.

28207559772 is a `hidden beast` number, since 2 + 82 + 0 + 7 + 559 + 7 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1085629 + ... + 1111307.

It is an arithmetic number, because the mean of its divisors is an integer number (871236800).

Almost surely, 2^28207559772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28207559772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41819366400).

28207559772 is an abundant number, since it is smaller than the sum of its proper divisors (55431173028).

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

28207559772 is a wasteful number, since it uses less digits than its factorization.

28207559772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27152 (or 27144 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 54.

The spelling of 28207559772 in words is "twenty-eight billion, two hundred seven million, five hundred fifty-nine thousand, seven hundred seventy-two".