28457892 has 30 divisors (see below), whose sum is σ = 74395398. Its totient is φ = 9485856.

The previous prime is 28457879. The next prime is 28457893. The reversal of 28457892 is 29875482.

It can be written as a sum of positive squares in only one way, i.e., 25948836 + 2509056 = 5094^2 + 1584^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28457893) 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 9 ways as a sum of consecutive naturals, for example, 43593 + ... + 44240.

Almost surely, 2^28457892 is an apocalyptic number.

It is an amenable number.

28457892 is an abundant number, since it is smaller than the sum of its proper divisors (45937506).

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

28457892 is a wasteful number, since it uses less digits than its factorization.

28457892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87849 (or 87838 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28457892 is about 5334.5938926970. The cubic root of 28457892 is about 305.3052287949.

The spelling of 28457892 in words is "twenty-eight million, four hundred fifty-seven thousand, eight hundred ninety-two".