28507766 has 8 divisors (see below), whose sum is σ = 48870480. Its totient is φ = 12217608.

The previous prime is 28507757. The next prime is 28507789. The reversal of 28507766 is 66770582.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1018121 + ... + 1018148.

It is an arithmetic number, because the mean of its divisors is an integer number (6108810).

Almost surely, 2^28507766 is an apocalyptic number.

28507766 is a deficient number, since it is larger than the sum of its proper divisors (20362714).

28507766 is a wasteful number, since it uses less digits than its factorization.

28507766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036278.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 28507766 is about 5339.2664290144. The cubic root of 28507766 is about 305.4834793645.

The spelling of 28507766 in words is "twenty-eight million, five hundred seven thousand, seven hundred sixty-six".