28280764 has 6 divisors (see below), whose sum is σ = 49491344. Its totient is φ = 14140380.

The previous prime is 28280761. The next prime is 28280779. The reversal of 28280764 is 46708282.

It is a super-2 number, since 2×28280764² = 1599603224847392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28280761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535092 + ... + 3535099.

Almost surely, 2^28280764 is an apocalyptic number.

It is an amenable number.

28280764 is a deficient number, since it is larger than the sum of its proper divisors (21210580).

28280764 is a wasteful number, since it uses less digits than its factorization.

28280764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070195 (or 7070193 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28280764 is about 5317.9661525813. The cubic root of 28280764 is about 304.6704817091.

The spelling of 28280764 in words is "twenty-eight million, two hundred eighty thousand, seven hundred sixty-four".