65800989 has 24 divisors (see below), whose sum is σ = 97886880. Its totient is φ = 42575712.

The previous prime is 65800967. The next prime is 65800991. The reversal of 65800989 is 98900856.

It is not a de Polignac number, because 65800989 - 2⁸ = 65800733 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65800919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43327 + ... + 44819.

It is an arithmetic number, because the mean of its divisors is an integer number (4078620).

Almost surely, 2^65800989 is an apocalyptic number.

It is an amenable number.

65800989 is a deficient number, since it is larger than the sum of its proper divisors (32085891).

65800989 is a wasteful number, since it uses less digits than its factorization.

65800989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 65800989 is about 8111.7808772180. The cubic root of 65800989 is about 403.7174056317.

The spelling of 65800989 in words is "sixty-five million, eight hundred thousand, nine hundred eighty-nine".