28756213365 has 32 divisors (see below), whose sum is σ = 50206957056. Its totient is φ = 13938436160.

The previous prime is 28756213361. The next prime is 28756213391. The reversal of 28756213365 is 56331265782.

It is a happy number.

It is not a de Polignac number, because 28756213365 - 2² = 28756213361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756213361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604582 + ... + 650408.

It is an arithmetic number, because the mean of its divisors is an integer number (1568967408).

Almost surely, 2^28756213365 is an apocalyptic number.

It is an amenable number.

28756213365 is a deficient number, since it is larger than the sum of its proper divisors (21450743691).

28756213365 is a wasteful number, since it uses less digits than its factorization.

28756213365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49649.

The product of its digits is 1814400, while the sum is 48.

The spelling of 28756213365 in words is "twenty-eight billion, seven hundred fifty-six million, two hundred thirteen thousand, three hundred sixty-five".