65987089 has 4 divisors (see below), whose sum is σ = 75413824. Its totient is φ = 56560356.

The previous prime is 65987083. The next prime is 65987099. The reversal of 65987089 is 98078956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65987089 - 2¹⁵ = 65954321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65987083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4713357 + ... + 4713370.

It is an arithmetic number, because the mean of its divisors is an integer number (18853456).

Almost surely, 2^65987089 is an apocalyptic number.

It is an amenable number.

65987089 is a deficient number, since it is larger than the sum of its proper divisors (9426735).

65987089 is an equidigital number, since it uses as much as digits as its factorization.

65987089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426734.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 65987089 is about 8123.2437486512. The cubic root of 65987089 is about 404.0976486013.

The spelling of 65987089 in words is "sixty-five million, nine hundred eighty-seven thousand, eighty-nine".