28431442 has 8 divisors (see below), whose sum is σ = 45927756. Its totient is φ = 13122192.

The previous prime is 28431439. The next prime is 28431457. The reversal of 28431442 is 24413482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28419561 + 11881 = 5331^2 + 109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28431442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546733 + ... + 546784.

Almost surely, 2^28431442 is an apocalyptic number.

28431442 is a deficient number, since it is larger than the sum of its proper divisors (17496314).

28431442 is a wasteful number, since it uses less digits than its factorization.

28431442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093532.

The product of its digits is 6144, while the sum is 28.

The square root of 28431442 is about 5332.1142148307. The cubic root of 28431442 is about 305.2106114980.

The spelling of 28431442 in words is "twenty-eight million, four hundred thirty-one thousand, four hundred forty-two".