28019745 has 48 divisors (see below), whose sum is σ = 52782912. Its totient is φ = 13668480.

The previous prime is 28019743. The next prime is 28019777. The reversal of 28019745 is 54791082.

It is not a de Polignac number, because 28019745 - 2¹ = 28019743 is a prime.

It is a super-2 number, since 2×28019745² = 1570212219730050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28019743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123322 + ... + 123548.

It is an arithmetic number, because the mean of its divisors is an integer number (1099644).

Almost surely, 2^28019745 is an apocalyptic number.

It is an amenable number.

28019745 is a deficient number, since it is larger than the sum of its proper divisors (24763167).

28019745 is a wasteful number, since it uses less digits than its factorization.

28019745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28019745 is about 5293.3680204573. The cubic root of 28019745 is about 303.7302583319.

The spelling of 28019745 in words is "twenty-eight million, nineteen thousand, seven hundred forty-five".