64291889 has 4 divisors (see below), whose sum is σ = 64321524. Its totient is φ = 64262256.

The previous prime is 64291873. The next prime is 64291897. The reversal of 64291889 is 98819246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12567025 + 51724864 = 3545^2 + 7192^2 .

It is a cyclic number.

It is not a de Polignac number, because 64291889 - 2⁴ = 64291873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64291819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11282 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (16080381).

Almost surely, 2^64291889 is an apocalyptic number.

It is an amenable number.

64291889 is a deficient number, since it is larger than the sum of its proper divisors (29635).

64291889 is a wasteful number, since it uses less digits than its factorization.

64291889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29634.

The product of its digits is 248832, while the sum is 47.

The square root of 64291889 is about 8018.2223092154. Note that the first 3 decimals coincide. The cubic root of 64291889 is about 400.6071799483.

The spelling of 64291889 in words is "sixty-four million, two hundred ninety-one thousand, eight hundred eighty-nine".