28066738 has 16 divisors (see below), whose sum is σ = 48182400. Its totient is φ = 12011616.

The previous prime is 28066723. The next prime is 28066747. The reversal of 28066738 is 83766082.

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 28066738.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18870 + ... + 20302.

It is an arithmetic number, because the mean of its divisors is an integer number (3011400).

Almost surely, 2^28066738 is an apocalyptic number.

28066738 is a deficient number, since it is larger than the sum of its proper divisors (20115662).

28066738 is a wasteful number, since it uses less digits than its factorization.

28066738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28066738 is about 5297.8050171746. The cubic root of 28066738 is about 303.8999627561.

The spelling of 28066738 in words is "twenty-eight million, sixty-six thousand, seven hundred thirty-eight".