28758132 has 48 divisors (see below), whose sum is σ = 80297280. Its totient is φ = 8848224.

The previous prime is 28758113. The next prime is 28758137. The reversal of 28758132 is 23185782.

It is a super-2 number, since 2×28758132² = 1654060312258848, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28758137) 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 15 ways as a sum of consecutive naturals, for example, 8838 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (1672860).

Almost surely, 2^28758132 is an apocalyptic number.

It is an amenable number.

28758132 is an abundant number, since it is smaller than the sum of its proper divisors (51539148).

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

28758132 is a wasteful number, since it uses less digits than its factorization.

28758132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20509 (or 20501 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28758132 is about 5362.6609066768. The cubic root of 28758132 is about 306.3751646094.

The spelling of 28758132 in words is "twenty-eight million, seven hundred fifty-eight thousand, one hundred thirty-two".