28623132 has 90 divisors (see below), whose sum is σ = 78689688. Its totient is φ = 9071568.

The previous prime is 28623071. The next prime is 28623143. The reversal of 28623132 is 23132682.

28623132 is a `hidden beast` number, since 2 + 8 + 623 + 1 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28623096 and 28623105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 171313 + ... + 171479.

Almost surely, 2^28623132 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 28623132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39344844).

28623132 is an abundant number, since it is smaller than the sum of its proper divisors (50066556).

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

28623132 is a wasteful number, since it uses less digits than its factorization.

28623132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 195 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 28623132 is about 5350.0590650945. The cubic root of 28623132 is about 305.8950043468.

The spelling of 28623132 in words is "twenty-eight million, six hundred twenty-three thousand, one hundred thirty-two".