28249992 has 32 divisors (see below), whose sum is σ = 78472800. Its totient is φ = 9416592.

The previous prime is 28249987. The next prime is 28249993. The reversal of 28249992 is 29994282.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28249993) 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, 65178 + ... + 65609.

It is an arithmetic number, because the mean of its divisors is an integer number (2452275).

Almost surely, 2^28249992 is an apocalyptic number.

It is an amenable number.

28249992 is an abundant number, since it is smaller than the sum of its proper divisors (50222808).

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

28249992 is a wasteful number, since it uses less digits than its factorization.

28249992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130802 (or 130792 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 28249992 is about 5315.0721537906. The cubic root of 28249992 is about 304.5599386970.

It can be divided in two parts, 28249 and 992, that added together give a square (29241 = 171²).

The spelling of 28249992 in words is "twenty-eight million, two hundred forty-nine thousand, nine hundred ninety-two".