28868742 has 72 divisors (see below), whose sum is σ = 73945872. Its totient is φ = 8114400.

The previous prime is 28868711. The next prime is 28868761. The reversal of 28868742 is 24786882.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62392 + ... + 62852.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026).

Almost surely, 2^28868742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28868742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36972936).

28868742 is an abundant number, since it is smaller than the sum of its proper divisors (45077130).

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

28868742 is a wasteful number, since it uses less digits than its factorization.

28868742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 544 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28868742 is about 5372.9639864790. The cubic root of 28868742 is about 306.7674571558.

It can be divided in two parts, 2886 and 8742, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28868742 in words is "twenty-eight million, eight hundred sixty-eight thousand, seven hundred forty-two".