28299924 has 18 divisors (see below), whose sum is σ = 71536010. Its totient is φ = 9433296.

The previous prime is 28299923. The next prime is 28299979. The reversal of 28299924 is 42999282.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 13089924 = 3900^2 + 3618^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 28299924.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28299923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 393019 + ... + 393090.

Almost surely, 2^28299924 is an apocalyptic number.

It is an amenable number.

28299924 is an abundant number, since it is smaller than the sum of its proper divisors (43236086).

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

28299924 is a wasteful number, since it uses less digits than its factorization.

28299924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786119 (or 786114 counting only the distinct ones).

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

The square root of 28299924 is about 5319.7672881433. The cubic root of 28299924 is about 304.7392701459.

It can be divided in two parts, 282999 and 24, that multiplied together give a palindrome (6791976).

The spelling of 28299924 in words is "twenty-eight million, two hundred ninety-nine thousand, nine hundred twenty-four".