65604989 has 8 divisors (see below), whose sum is σ = 71859960. Its totient is φ = 59616256.

The previous prime is 65604983. The next prime is 65605003. The reversal of 65604989 is 98940656.

It can be written as a sum of positive squares in 4 ways, for example, as 26604964 + 39000025 = 5158^2 + 6245^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 65604989 - 2⁸ = 65604733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65604983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66044 + ... + 67029.

It is an arithmetic number, because the mean of its divisors is an integer number (8982495).

Almost surely, 2^65604989 is an apocalyptic number.

It is an amenable number.

65604989 is a deficient number, since it is larger than the sum of its proper divisors (6254971).

65604989 is a wasteful number, since it uses less digits than its factorization.

65604989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133119.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 65604989 is about 8099.6906731060. The cubic root of 65604989 is about 403.3161588358.

The spelling of 65604989 in words is "sixty-five million, six hundred four thousand, nine hundred eighty-nine".