64278889 has 2 divisors, whose sum is σ = 64278890. Its totient is φ = 64278888.

The previous prime is 64278871. The next prime is 64278899. The reversal of 64278889 is 98887246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47403225 + 16875664 = 6885^2 + 4108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64278889 is a prime.

It is not a weakly prime, because it can be changed into another prime (64278899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32139444 + 32139445.

It is an arithmetic number, because the mean of its divisors is an integer number (32139445).

Almost surely, 2^64278889 is an apocalyptic number.

It is an amenable number.

64278889 is a deficient number, since it is larger than the sum of its proper divisors (1).

64278889 is an equidigital number, since it uses as much as digits as its factorization.

64278889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 52.

The square root of 64278889 is about 8017.4116147295. The cubic root of 64278889 is about 400.5801768303.

The spelling of 64278889 in words is "sixty-four million, two hundred seventy-eight thousand, eight hundred eighty-nine".