28021365 has 48 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 14152320.

The previous prime is 28021363. The next prime is 28021369. The reversal of 28021365 is 56312082.

28021365 is a `hidden beast` number, since 280 + 21 + 365 = 666.

It is not a de Polignac number, because 28021365 - 2¹ = 28021363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28021363) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73746 + ... + 74124.

It is an arithmetic number, because the mean of its divisors is an integer number (1067040).

Almost surely, 2^28021365 is an apocalyptic number.

It is an amenable number.

28021365 is a deficient number, since it is larger than the sum of its proper divisors (23196555).

28021365 is a wasteful number, since it uses less digits than its factorization.

28021365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28021365 is about 5293.5210399128. The cubic root of 28021365 is about 303.7361117462.

The spelling of 28021365 in words is "twenty-eight million, twenty-one thousand, three hundred sixty-five".