28261938 has 8 divisors (see below), whose sum is σ = 56523888. Its totient is φ = 9420644.

The previous prime is 28261931. The next prime is 28261951. The reversal of 28261938 is 83916282.

It is a happy number.

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

28261938 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 28261896 and 28261905.

It is not an unprimeable number, because it can be changed into a prime (28261931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2355156 + ... + 2355167.

It is an arithmetic number, because the mean of its divisors is an integer number (7065486).

Almost surely, 2^28261938 is an apocalyptic number.

28261938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28261938 is a wasteful number, since it uses less digits than its factorization.

28261938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710328.

The product of its digits is 41472, while the sum is 39.

The square root of 28261938 is about 5316.1958203211. The cubic root of 28261938 is about 304.6028621346.

The spelling of 28261938 in words is "twenty-eight million, two hundred sixty-one thousand, nine hundred thirty-eight".