664269447 has 8 divisors (see below), whose sum is σ = 916233840. Its totient is φ = 427575680.

The previous prime is 664269439. The next prime is 664269449. The reversal of 664269447 is 744962466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664269447 - 2³ = 664269439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664269396 and 664269405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664269449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3817554 + ... + 3817727.

It is an arithmetic number, because the mean of its divisors is an integer number (114529230).

Almost surely, 2^664269447 is an apocalyptic number.

664269447 is a deficient number, since it is larger than the sum of its proper divisors (251964393).

664269447 is a wasteful number, since it uses less digits than its factorization.

664269447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7635313.

The product of its digits is 1741824, while the sum is 48.

The square root of 664269447 is about 25773.4252089240. The cubic root of 664269447 is about 872.5321250449.

It can be divided in two parts, 6 and 64269447, that added together give a triangular number (64269453 = T₁₁₃₃₇).

The spelling of 664269447 in words is "six hundred sixty-four million, two hundred sixty-nine thousand, four hundred forty-seven".