28039749 has 16 divisors (see below), whose sum is σ = 39840192. Its totient is φ = 17480448.

The previous prime is 28039709. The next prime is 28039771. The reversal of 28039749 is 94793082.

It is not a de Polignac number, because 28039749 - 2⁷ = 28039621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28039749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28039709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6627 + ... + 9999.

It is an arithmetic number, because the mean of its divisors is an integer number (2490012).

Almost surely, 2^28039749 is an apocalyptic number.

It is an amenable number.

28039749 is a deficient number, since it is larger than the sum of its proper divisors (11800443).

28039749 is a wasteful number, since it uses less digits than its factorization.

28039749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 28039749 is about 5295.2572175485. The cubic root of 28039749 is about 303.8025213588.

The spelling of 28039749 in words is "twenty-eight million, thirty-nine thousand, seven hundred forty-nine".