28907842 has 4 divisors (see below), whose sum is σ = 43361766. Its totient is φ = 14453920.

The previous prime is 28907831. The next prime is 28907861. The reversal of 28907842 is 24870982.

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., 18481401 + 10426441 = 4299^2 + 3229^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28907795 and 28907804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7226959 + ... + 7226962.

Almost surely, 2^28907842 is an apocalyptic number.

28907842 is a deficient number, since it is larger than the sum of its proper divisors (14453924).

28907842 is a wasteful number, since it uses less digits than its factorization.

28907842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14453923.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28907842 is about 5376.6013428559. The cubic root of 28907842 is about 306.9058905803.

The spelling of 28907842 in words is "twenty-eight million, nine hundred seven thousand, eight hundred forty-two".