28431088 has 40 divisors (see below), whose sum is σ = 63627872. Its totient is φ = 12054528.

The previous prime is 28431083. The next prime is 28431113. The reversal of 28431088 is 88013482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431083) 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 7 ways as a sum of consecutive naturals, for example, 9556 + ... + 12172.

Almost surely, 2^28431088 is an apocalyptic number.

28431088 is a gapful number since it is divisible by the number (28) 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 28431088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31813936).

28431088 is an abundant number, since it is smaller than the sum of its proper divisors (35196784).

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

28431088 is a wasteful number, since it uses less digits than its factorization.

28431088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 28431088 is about 5332.0810196395. The cubic root of 28431088 is about 305.2093447666.

The spelling of 28431088 in words is "twenty-eight million, four hundred thirty-one thousand, eighty-eight".