28937723 has 4 divisors (see below), whose sum is σ = 30639960. Its totient is φ = 27235488.

The previous prime is 28937717. The next prime is 28937731. The reversal of 28937723 is 32773982.

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 28937723 - 2⁶ = 28937659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28937773) 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, 851093 + ... + 851126.

It is an arithmetic number, because the mean of its divisors is an integer number (7659990).

Almost surely, 2^28937723 is an apocalyptic number.

28937723 is a deficient number, since it is larger than the sum of its proper divisors (1702237).

28937723 is a wasteful number, since it uses less digits than its factorization.

28937723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702236.

The product of its digits is 127008, while the sum is 41.

The square root of 28937723 is about 5379.3794251754. The cubic root of 28937723 is about 307.0116000384.

The spelling of 28937723 in words is "twenty-eight million, nine hundred thirty-seven thousand, seven hundred twenty-three".