28288442 has 64 divisors (see below), whose sum is σ = 56899584. Its totient is φ = 10229760.

The previous prime is 28288439. The next prime is 28288499. The reversal of 28288442 is 24488282.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28288396 and 28288405.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126743 + ... + 126965.

It is an arithmetic number, because the mean of its divisors is an integer number (889056).

Almost surely, 2^28288442 is an apocalyptic number.

28288442 is an abundant number, since it is smaller than the sum of its proper divisors (28611142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28288442 is a wasteful number, since it uses less digits than its factorization.

28288442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303.

The product of its digits is 65536, while the sum is 38.

The square root of 28288442 is about 5318.6879961133. The cubic root of 28288442 is about 304.6980510762.

It can be divided in two parts, 28288 and 442, that multiplied together give a square (12503296 = 3536²).

The spelling of 28288442 in words is "twenty-eight million, two hundred eighty-eight thousand, four hundred forty-two".