28171438 has 16 divisors (see below), whose sum is σ = 43230960. Its totient is φ = 13764096.

The previous prime is 28171421. The next prime is 28171463. The reversal of 28171438 is 83417182.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22156 + ... + 23392.

It is an arithmetic number, because the mean of its divisors is an integer number (2701935).

Almost surely, 2^28171438 is an apocalyptic number.

28171438 is a deficient number, since it is larger than the sum of its proper divisors (15059522).

28171438 is a wasteful number, since it uses less digits than its factorization.

28171438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491.

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

The square root of 28171438 is about 5307.6772697669. The cubic root of 28171438 is about 304.2773827342.

The spelling of 28171438 in words is "twenty-eight million, one hundred seventy-one thousand, four hundred thirty-eight".