28931652 has 72 divisors (see below), whose sum is σ = 75555480. Its totient is φ = 9331200.

The previous prime is 28931641. The next prime is 28931657. The reversal of 28931652 is 25613982.

It can be written as a sum of positive squares in 4 ways, for example, as 15492096 + 13439556 = 3936^2 + 3666^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (25920) is a multiple of the sum of its prime divisors (288).

It is not an unprimeable number, because it can be changed into a prime (28931657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265374 + ... + 265482.

Almost surely, 2^28931652 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 28931652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37777740).

28931652 is an abundant number, since it is smaller than the sum of its proper divisors (46623828).

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

28931652 is a wasteful number, since it uses less digits than its factorization.

28931652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 288 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28931652 is about 5378.8151111560. The cubic root of 28931652 is about 306.9901286672.

The spelling of 28931652 in words is "twenty-eight million, nine hundred thirty-one thousand, six hundred fifty-two".