65987390 has 32 divisors (see below), whose sum is σ = 136555200. Its totient is φ = 22489344.

The previous prime is 65987381. The next prime is 65987417. The reversal of 65987390 is 9378956.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9386 + ... + 14834.

It is an arithmetic number, because the mean of its divisors is an integer number (4267350).

Almost surely, 2^65987390 is an apocalyptic number.

65987390 is an abundant number, since it is smaller than the sum of its proper divisors (70567810).

65987390 is a wasteful number, since it uses less digits than its factorization.

65987390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 65987390 is about 8123.2622757116. The cubic root of 65987390 is about 404.0982630307.

The spelling of 65987390 in words is "sixty-five million, nine hundred eighty-seven thousand, three hundred ninety".