28311745 has 32 divisors (see below), whose sum is σ = 42725376. Its totient is φ = 17496000.

The previous prime is 28311737. The next prime is 28311757. The reversal of 28311745 is 54711382.

It is not a de Polignac number, because 28311745 - 2³ = 28311737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57892 + ... + 58378.

It is an arithmetic number, because the mean of its divisors is an integer number (1335168).

Almost surely, 2^28311745 is an apocalyptic number.

It is an amenable number.

28311745 is a deficient number, since it is larger than the sum of its proper divisors (14413631).

28311745 is a wasteful number, since it uses less digits than its factorization.

28311745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its digits is 6720, while the sum is 31.

The square root of 28311745 is about 5320.8782169864. The cubic root of 28311745 is about 304.7816945409.

The spelling of 28311745 in words is "twenty-eight million, three hundred eleven thousand, seven hundred forty-five".