28801739 has 4 divisors (see below), whose sum is σ = 30317640. Its totient is φ = 27285840.

The previous prime is 28801709. The next prime is 28801783. The reversal of 28801739 is 93710882.

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 28801739 - 2⁸ = 28801483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28801709) 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, 757922 + ... + 757959.

It is an arithmetic number, because the mean of its divisors is an integer number (7579410).

Almost surely, 2^28801739 is an apocalyptic number.

28801739 is a deficient number, since it is larger than the sum of its proper divisors (1515901).

28801739 is a wasteful number, since it uses less digits than its factorization.

28801739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515900.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28801739 is about 5366.7251653126. The cubic root of 28801739 is about 306.5299423337.

The spelling of 28801739 in words is "twenty-eight million, eight hundred one thousand, seven hundred thirty-nine".