28499388 has 24 divisors (see below), whose sum is σ = 67492992. Its totient is φ = 9357744.

The previous prime is 28499381. The next prime is 28499389. The reversal of 28499388 is 88399482.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28499388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28499381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16920 + ... + 18527.

It is an arithmetic number, because the mean of its divisors is an integer number (2812208).

Almost surely, 2^28499388 is an apocalyptic number.

It is an amenable number.

28499388 is an abundant number, since it is smaller than the sum of its proper divisors (38993604).

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

28499388 is a wasteful number, since it uses less digits than its factorization.

28499388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35521 (or 35519 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 28499388 is about 5338.4818066563. The cubic root of 28499388 is about 305.4535507788.

The spelling of 28499388 in words is "twenty-eight million, four hundred ninety-nine thousand, three hundred eighty-eight".