28501632 has 80 divisors (see below), whose sum is σ = 84851250. Its totient is φ = 9497088.

The previous prime is 28501621. The next prime is 28501657. The reversal of 28501632 is 23610582.

28501632 is a `hidden beast` number, since 28 + 5 + 0 + 1 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27625536 + 876096 = 5256^2 + 936^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 28501596 and 28501605.

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 9 ways as a sum of consecutive naturals, for example, 8994 + ... + 11742.

Almost surely, 2^28501632 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 28501632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42425625).

28501632 is an abundant number, since it is smaller than the sum of its proper divisors (56349618).

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

28501632 is an equidigital number, since it uses as much as digits as its factorization.

28501632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28501632 is about 5338.6919746320. The cubic root of 28501632 is about 305.4615675566.

The spelling of 28501632 in words is "twenty-eight million, five hundred one thousand, six hundred thirty-two".