28770756 has 48 divisors (see below), whose sum is σ = 78804096. Its totient is φ = 7997184.

The previous prime is 28770751. The next prime is 28770757. The reversal of 28770756 is 65707782.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28770751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (1641752).

Almost surely, 2^28770756 is an apocalyptic number.

It is an amenable number.

28770756 is an abundant number, since it is smaller than the sum of its proper divisors (50033340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28770756 is a wasteful number, since it uses less digits than its factorization.

28770756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9308 (or 9306 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 28770756 is about 5363.8378051541. The cubic root of 28770756 is about 306.4199880386.

The spelling of 28770756 in words is "twenty-eight million, seven hundred seventy thousand, seven hundred fifty-six".