28291032 has 216 divisors, whose sum is σ = 100968660. Its totient is φ = 7348320.

The previous prime is 28291013. The next prime is 28291063. The reversal of 28291032 is 23019282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (216).

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 = 28290987 and 28291005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2571907 + ... + 2571917.

Almost surely, 2^28291032 is an apocalyptic number.

28291032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28291032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50484330).

28291032 is an abundant number, since it is smaller than the sum of its proper divisors (72677628).

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

28291032 is an equidigital number, since it uses as much as digits as its factorization.

28291032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28291032 is about 5318.9314716398. The cubic root of 28291032 is about 304.7073498547.

The spelling of 28291032 in words is "twenty-eight million, two hundred ninety-one thousand, thirty-two".