64886989 has 2 divisors, whose sum is σ = 64886990. Its totient is φ = 64886988.

The previous prime is 64886959. The next prime is 64887023. The reversal of 64886989 is 98968846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59444100 + 5442889 = 7710^2 + 2333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64886989 is a prime.

It is a super-2 number, since 2×64886989² = 8420642682972242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64886959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32443494 + 32443495.

It is an arithmetic number, because the mean of its divisors is an integer number (32443495).

Almost surely, 2^64886989 is an apocalyptic number.

It is an amenable number.

64886989 is a deficient number, since it is larger than the sum of its proper divisors (1).

64886989 is an equidigital number, since it uses as much as digits as its factorization.

64886989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 58.

The square root of 64886989 is about 8055.2460545908. The cubic root of 64886989 is about 401.8394220999.

The spelling of 64886989 in words is "sixty-four million, eight hundred eighty-six thousand, nine hundred eighty-nine".