28907738 has 8 divisors (see below), whose sum is σ = 43884288. Its totient is φ = 14279644.

The previous prime is 28907731. The next prime is 28907771. The reversal of 28907738 is 83770982.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28907731) 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 in 3 ways as a sum of consecutive naturals, for example, 86906 + ... + 87237.

It is an arithmetic number, because the mean of its divisors is an integer number (5485536).

Almost surely, 2^28907738 is an apocalyptic number.

28907738 is a deficient number, since it is larger than the sum of its proper divisors (14976550).

28907738 is a wasteful number, since it uses less digits than its factorization.

28907738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174228.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28907738 is about 5376.5916713100. The cubic root of 28907738 is about 306.9055225343.

The spelling of 28907738 in words is "twenty-eight million, nine hundred seven thousand, seven hundred thirty-eight".