28081801252 has 12 divisors (see below), whose sum is σ = 49147369600. Its totient is φ = 14039695656.

The previous prime is 28081801229. The next prime is 28081801259. The reversal of 28081801252 is 25210818082.

It is not an unprimeable number, because it can be changed into a prime (28081801259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247752 + ... + 342847.

Almost surely, 2^28081801252 is an apocalyptic number.

It is an amenable number.

28081801252 is a deficient number, since it is larger than the sum of its proper divisors (21065568348).

28081801252 is a wasteful number, since it uses less digits than its factorization.

28081801252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602490 (or 602488 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 37.

The spelling of 28081801252 in words is "twenty-eight billion, eighty-one million, eight hundred one thousand, two hundred fifty-two".