28933739 has 4 divisors (see below), whose sum is σ = 29095560. Its totient is φ = 28771920.

The previous prime is 28933733. The next prime is 28933753. The reversal of 28933739 is 93733982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28933739 - 2⁸ = 28933483 is a prime.

It is a super-2 number, since 2×28933739² = 1674322505040242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28933739.

It is not an unprimeable number, because it can be changed into a prime (28933733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80642 + ... + 80999.

It is an arithmetic number, because the mean of its divisors is an integer number (7273890).

Almost surely, 2^28933739 is an apocalyptic number.

28933739 is a deficient number, since it is larger than the sum of its proper divisors (161821).

28933739 is a wasteful number, since it uses less digits than its factorization.

28933739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161820.

The product of its digits is 244944, while the sum is 44.

The square root of 28933739 is about 5379.0091094922. The cubic root of 28933739 is about 306.9975101214.

The spelling of 28933739 in words is "twenty-eight million, nine hundred thirty-three thousand, seven hundred thirty-nine".