28767145 has 24 divisors (see below), whose sum is σ = 40190472. Its totient is φ = 19683840.

The previous prime is 28767143. The next prime is 28767157. The reversal of 28767145 is 54176782.

It can be written as a sum of positive squares in 4 ways, for example, as 9018009 + 19749136 = 3003^2 + 4444^2 .

It is not a de Polignac number, because 28767145 - 2¹ = 28767143 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28767098 and 28767107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28767143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8887 + ... + 11683.

It is an arithmetic number, because the mean of its divisors is an integer number (1674603).

Almost surely, 2^28767145 is an apocalyptic number.

It is an amenable number.

28767145 is a deficient number, since it is larger than the sum of its proper divisors (11423327).

28767145 is a wasteful number, since it uses less digits than its factorization.

28767145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841 (or 2830 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 28767145 is about 5363.5011885894. The cubic root of 28767145 is about 306.4071679738.

The spelling of 28767145 in words is "twenty-eight million, seven hundred sixty-seven thousand, one hundred forty-five".