28155957210 has 80 divisors (see below), whose sum is σ = 75774301416. Its totient is φ = 7501704192.

The previous prime is 28155957187. The next prime is 28155957211. The reversal of 28155957210 is 1275955182.

28155957210 is a `hidden beast` number, since 2 + 8 + 15 + 59 + 572 + 10 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26986932729 + 1169024481 = 164277^2 + 34191^2 .

It is a super-2 number, since 2×28155957210² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28155957211) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 951762 + ... + 980898.

Almost surely, 2^28155957210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28155957210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37887150708).

28155957210 is an abundant number, since it is smaller than the sum of its proper divisors (47618344206).

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

28155957210 is a wasteful number, since it uses less digits than its factorization.

28155957210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30349 (or 30340 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 28155957210 in words is "twenty-eight billion, one hundred fifty-five million, nine hundred fifty-seven thousand, two hundred ten".