64632989 has 2 divisors, whose sum is σ = 64632990. Its totient is φ = 64632988.

The previous prime is 64632979. The next prime is 64632991. The reversal of 64632989 is 98923646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58216900 + 6416089 = 7630^2 + 2533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64632989 is a prime.

It is a super-3 number, since 3×64632989³ (a number of 24 digits) contains 333 as substring.

Together with 64632991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64632979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32316494 + 32316495.

It is an arithmetic number, because the mean of its divisors is an integer number (32316495).

Almost surely, 2^64632989 is an apocalyptic number.

It is an amenable number.

64632989 is a deficient number, since it is larger than the sum of its proper divisors (1).

64632989 is an equidigital number, since it uses as much as digits as its factorization.

64632989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 47.

The square root of 64632989 is about 8039.4644722146. The cubic root of 64632989 is about 401.3144032129.

The spelling of 64632989 in words is "sixty-four million, six hundred thirty-two thousand, nine hundred eighty-nine".