28939749 has 8 divisors (see below), whose sum is σ = 39314592. Its totient is φ = 18929040.

The previous prime is 28939741. The next prime is 28939753. The reversal of 28939749 is 94793982.

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

It is not a de Polignac number, because 28939749 - 2³ = 28939741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90847 + ... + 91164.

It is an arithmetic number, because the mean of its divisors is an integer number (4914324).

Almost surely, 2^28939749 is an apocalyptic number.

It is an amenable number.

28939749 is a deficient number, since it is larger than the sum of its proper divisors (10374843).

28939749 is a wasteful number, since it uses less digits than its factorization.

28939749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182067.

The product of its digits is 979776, while the sum is 51.

The square root of 28939749 is about 5379.5677335637. The cubic root of 28939749 is about 307.0187647462.

The spelling of 28939749 in words is "twenty-eight million, nine hundred thirty-nine thousand, seven hundred forty-nine".