28775739 has 4 divisors (see below), whose sum is σ = 38367656. Its totient is φ = 19183824.

The previous prime is 28775699. The next prime is 28775741. The reversal of 28775739 is 93757782.

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

It is not a de Polignac number, because 28775739 - 2¹³ = 28767547 is a prime.

It is a super-2 number, since 2×28775739² = 1656086309992242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28775759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4795954 + ... + 4795959.

It is an arithmetic number, because the mean of its divisors is an integer number (9591914).

Almost surely, 2^28775739 is an apocalyptic number.

28775739 is a deficient number, since it is larger than the sum of its proper divisors (9591917).

28775739 is an equidigital number, since it uses as much as digits as its factorization.

28775739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9591916.

The product of its digits is 740880, while the sum is 48.

The square root of 28775739 is about 5364.3022845474. The cubic root of 28775739 is about 306.4376773276.

The spelling of 28775739 in words is "twenty-eight million, seven hundred seventy-five thousand, seven hundred thirty-nine".