28109742 has 8 divisors (see below), whose sum is σ = 56219496. Its totient is φ = 9369912.

The previous prime is 28109651. The next prime is 28109747. The reversal of 28109742 is 24790182.

It is a happy number.

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

28109742 is an admirable number.

It is a super-3 number, since 3×28109742³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28109747) 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, 2342473 + ... + 2342484.

It is an arithmetic number, because the mean of its divisors is an integer number (7027437).

Almost surely, 2^28109742 is an apocalyptic number.

28109742 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.

28109742 is a wasteful number, since it uses less digits than its factorization.

28109742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684962.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28109742 is about 5301.8621257064. The cubic root of 28109742 is about 304.0550959120.

The spelling of 28109742 in words is "twenty-eight million, one hundred nine thousand, seven hundred forty-two".