64489805 has 4 divisors (see below), whose sum is σ = 77387772. Its totient is φ = 51591840.

The previous prime is 64489793. The next prime is 64489811. The reversal of 64489805 is 50898446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50898446 = 2 ⋅25449223.

It can be written as a sum of positive squares in 2 ways, for example, as 22005481 + 42484324 = 4691^2 + 6518^2 .

It is not a de Polignac number, because 64489805 - 2⁸ = 64489549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6448976 + ... + 6448985.

It is an arithmetic number, because the mean of its divisors is an integer number (19346943).

Almost surely, 2^64489805 is an apocalyptic number.

It is an amenable number.

64489805 is a deficient number, since it is larger than the sum of its proper divisors (12897967).

64489805 is a wasteful number, since it uses less digits than its factorization.

64489805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12897966.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 64489805 is about 8030.5544640454. The cubic root of 64489805 is about 401.0178349167.

The spelling of 64489805 in words is "sixty-four million, four hundred eighty-nine thousand, eight hundred five".