28242738 has 24 divisors (see below), whose sum is σ = 61603776. Its totient is φ = 9351000.

The previous prime is 28242719. The next prime is 28242743. The reversal of 28242738 is 83724282.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2478 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (2566824).

Almost surely, 2^28242738 is an apocalyptic number.

28242738 is an abundant number, since it is smaller than the sum of its proper divisors (33361038).

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

28242738 is a wasteful number, since it uses less digits than its factorization.

28242738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550 (or 10547 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28242738 is about 5314.3897109640. The cubic root of 28242738 is about 304.5338682834.

The spelling of 28242738 in words is "twenty-eight million, two hundred forty-two thousand, seven hundred thirty-eight".