28507768 has 16 divisors (see below), whose sum is σ = 54054000. Its totient is φ = 14093376.

The previous prime is 28507757. The next prime is 28507789. The reversal of 28507768 is 86770582.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19308 + ... + 20731.

It is an arithmetic number, because the mean of its divisors is an integer number (3378375).

Almost surely, 2^28507768 is an apocalyptic number.

It is an amenable number.

28507768 is a deficient number, since it is larger than the sum of its proper divisors (25546232).

28507768 is a wasteful number, since it uses less digits than its factorization.

28507768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40134 (or 40130 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 28507768 is about 5339.2666163060. The cubic root of 28507768 is about 305.4834865083.

The spelling of 28507768 in words is "twenty-eight million, five hundred seven thousand, seven hundred sixty-eight".