28291792 has 20 divisors (see below), whose sum is σ = 55057860. Its totient is φ = 14083328.

The previous prime is 28291777. The next prime is 28291799. The reversal of 28291792 is 29719282.

It can be written as a sum of positive squares in 2 ways, for example, as 2322576 + 25969216 = 1524^2 + 5096^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (2752893).

Almost surely, 2^28291792 is an apocalyptic number.

It is an amenable number.

28291792 is a deficient number, since it is larger than the sum of its proper divisors (26766068).

28291792 is a wasteful number, since it uses less digits than its factorization.

28291792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7830 (or 7824 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 28291792 is about 5319.0029140808. The cubic root of 28291792 is about 304.7100783461.

The spelling of 28291792 in words is "twenty-eight million, two hundred ninety-one thousand, seven hundred ninety-two".