28807942 has 4 divisors (see below), whose sum is σ = 43211916. Its totient is φ = 14403970.

The previous prime is 28807939. The next prime is 28807943. The reversal of 28807942 is 24970882.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 28807895 and 28807904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7201984 + ... + 7201987.

It is an arithmetic number, because the mean of its divisors is an integer number (10802979).

Almost surely, 2^28807942 is an apocalyptic number.

28807942 is a deficient number, since it is larger than the sum of its proper divisors (14403974).

28807942 is a wasteful number, since it uses less digits than its factorization.

28807942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403973.

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

The square root of 28807942 is about 5367.3030471551. The cubic root of 28807942 is about 306.5519464304.

The spelling of 28807942 in words is "twenty-eight million, eight hundred seven thousand, nine hundred forty-two".