28907088 has 80 divisors (see below), whose sum is σ = 85946880. Its totient is φ = 8201088.

The previous prime is 28907077. The next prime is 28907093. The reversal of 28907088 is 88070982.

It is a happy number.

It is a hoax number, since the sum of its digits (42) 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 (42).

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 15 ways as a sum of consecutive naturals, for example, 76083 + ... + 76461.

It is an arithmetic number, because the mean of its divisors is an integer number (1074336).

Almost surely, 2^28907088 is an apocalyptic number.

28907088 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 28907088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42973440).

28907088 is an abundant number, since it is smaller than the sum of its proper divisors (57039792).

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

28907088 is a wasteful number, since it uses less digits than its factorization.

28907088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28907088 is about 5376.5312237538. The cubic root of 28907088 is about 306.9032222265.

The spelling of 28907088 in words is "twenty-eight million, nine hundred seven thousand, eighty-eight".