64671769 has 4 divisors (see below), whose sum is σ = 66901860. Its totient is φ = 62441680.

The previous prime is 64671767. The next prime is 64671781. The reversal of 64671769 is 96717646.

64671769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 36156169 + 28515600 = 6013^2 + 5340^2 .

It is a cyclic number.

It is not a de Polignac number, because 64671769 - 2¹ = 64671767 is a prime.

It is a super-2 number, since 2×64671769² = 8364875411178722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64671767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115002 + ... + 1115059.

It is an arithmetic number, because the mean of its divisors is an integer number (16725465).

Almost surely, 2^64671769 is an apocalyptic number.

It is an amenable number.

64671769 is a deficient number, since it is larger than the sum of its proper divisors (2230091).

64671769 is a wasteful number, since it uses less digits than its factorization.

64671769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230090.

The product of its digits is 381024, while the sum is 46.

The square root of 64671769 is about 8041.8759627341. The cubic root of 64671769 is about 401.3946504738.

The spelling of 64671769 in words is "sixty-four million, six hundred seventy-one thousand, seven hundred sixty-nine".