28213756 has 12 divisors (see below), whose sum is σ = 49633920. Its totient is φ = 14032640.

The previous prime is 28213753. The next prime is 28213763. The reversal of 28213756 is 65731282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17701 + ... + 19228.

It is an arithmetic number, because the mean of its divisors is an integer number (4136160).

Almost surely, 2^28213756 is an apocalyptic number.

It is an amenable number.

28213756 is a deficient number, since it is larger than the sum of its proper divisors (21420164).

28213756 is a wasteful number, since it uses less digits than its factorization.

28213756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37124 (or 37122 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 28213756 is about 5311.6622633597. The cubic root of 28213756 is about 304.4296642541.

The spelling of 28213756 in words is "twenty-eight million, two hundred thirteen thousand, seven hundred fifty-six".