28715838 has 16 divisors (see below), whose sum is σ = 57547776. Its totient is φ = 9552600.

The previous prime is 28715837. The next prime is 28715849. The reversal of 28715838 is 83851782.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28715838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438 + ... + 7713.

It is an arithmetic number, because the mean of its divisors is an integer number (3596736).

Almost surely, 2^28715838 is an apocalyptic number.

28715838 is an abundant number, since it is smaller than the sum of its proper divisors (28831938).

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

28715838 is a wasteful number, since it uses less digits than its factorization.

28715838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9679.

The product of its digits is 107520, while the sum is 42.

The square root of 28715838 is about 5358.7160775693. The cubic root of 28715838 is about 306.2248976787.

The spelling of 28715838 in words is "twenty-eight million, seven hundred fifteen thousand, eight hundred thirty-eight".