28770252 has 72 divisors (see below), whose sum is σ = 78963696. Its totient is φ = 8128512.

The previous prime is 28770227. The next prime is 28770257. The reversal of 28770252 is 25207782.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28770257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66228 + ... + 66660.

It is an arithmetic number, because the mean of its divisors is an integer number (1096718).

Almost surely, 2^28770252 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 28770252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39481848).

28770252 is an abundant number, since it is smaller than the sum of its proper divisors (50193444).

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

28770252 is a wasteful number, since it uses less digits than its factorization.

28770252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28770252 is about 5363.7908236619. The cubic root of 28770252 is about 306.4181987614.

The spelling of 28770252 in words is "twenty-eight million, seven hundred seventy thousand, two hundred fifty-two".