28406474 has 4 divisors (see below), whose sum is σ = 42609714. Its totient is φ = 14203236.

The previous prime is 28406453. The next prime is 28406503. The reversal of 28406474 is 47460482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47460482 = 2 ⋅23730241.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 390625 = 5293^2 + 625^2 .

It is a super-2 number, since 2×28406474² = 1613855530225352, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7101617 + ... + 7101620.

Almost surely, 2^28406474 is an apocalyptic number.

28406474 is a deficient number, since it is larger than the sum of its proper divisors (14203240).

28406474 is a wasteful number, since it uses less digits than its factorization.

28406474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14203239.

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 28406474 is about 5329.7724154039. The cubic root of 28406474 is about 305.1212417741.

The spelling of 28406474 in words is "twenty-eight million, four hundred six thousand, four hundred seventy-four".