28531764 has 60 divisors (see below), whose sum is σ = 75376224. Its totient is φ = 9410256.

The previous prime is 28531759. The next prime is 28531781. The reversal of 28531764 is 46713582.

28531764 is a `hidden beast` number, since 285 + 317 + 64 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 34257 + ... + 35079.

Almost surely, 2^28531764 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 28531764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37688112).

28531764 is an abundant number, since it is smaller than the sum of its proper divisors (46844460).

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

28531764 is a wasteful number, since it uses less digits than its factorization.

28531764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 935 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28531764 is about 5341.5132687283. The cubic root of 28531764 is about 305.5691745678.

The spelling of 28531764 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred sixty-four".