28770642 has 24 divisors (see below), whose sum is σ = 63395280. Its totient is φ = 9427320.

The previous prime is 28770611. The next prime is 28770649. The reversal of 28770642 is 24607782.

28770642 is a `hidden beast` number, since 2 + 8 + 7 + 7 + 0 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28770597 and 28770606.

It is not an unprimeable number, because it can be changed into a prime (28770649) 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 11 ways as a sum of consecutive naturals, for example, 12484 + ... + 14607.

It is an arithmetic number, because the mean of its divisors is an integer number (2641470).

Almost surely, 2^28770642 is an apocalyptic number.

28770642 is an abundant number, since it is smaller than the sum of its proper divisors (34624638).

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

28770642 is a wasteful number, since it uses less digits than its factorization.

28770642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27158 (or 27155 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 28770642 is about 5363.8271784240. The cubic root of 28770642 is about 306.4195833229.

The spelling of 28770642 in words is "twenty-eight million, seven hundred seventy thousand, six hundred forty-two".