28131874 has 4 divisors (see below), whose sum is σ = 42197814. Its totient is φ = 14065936.

The previous prime is 28131871. The next prime is 28131881. The reversal of 28131874 is 47813182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16524225 + 11607649 = 4065^2 + 3407^2 .

It is not an unprimeable number, because it can be changed into a prime (28131871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7032967 + ... + 7032970.

Almost surely, 2^28131874 is an apocalyptic number.

28131874 is a deficient number, since it is larger than the sum of its proper divisors (14065940).

28131874 is a wasteful number, since it uses less digits than its factorization.

28131874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14065939.

The product of its digits is 10752, while the sum is 34.

The square root of 28131874 is about 5303.9489062396. The cubic root of 28131874 is about 304.1348734977.

The spelling of 28131874 in words is "twenty-eight million, one hundred thirty-one thousand, eight hundred seventy-four".