28197442 has 24 divisors (see below), whose sum is σ = 52988796. Its totient is φ = 11154528.

The previous prime is 28197439. The next prime is 28197451. The reversal of 28197442 is 24479182.

It can be written as a sum of positive squares in 2 ways, for example, as 27050401 + 1147041 = 5201^2 + 1071^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9793 + ... + 12340.

Almost surely, 2^28197442 is an apocalyptic number.

28197442 is a deficient number, since it is larger than the sum of its proper divisors (24791354).

28197442 is a wasteful number, since it uses less digits than its factorization.

28197442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22162 (or 22155 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 28197442 is about 5310.1263638448. The cubic root of 28197442 is about 304.3709762970.

The spelling of 28197442 in words is "twenty-eight million, one hundred ninety-seven thousand, four hundred forty-two".