664483731 has 16 divisors (see below), whose sum is σ = 932691456. Its totient is φ = 419974016.

The previous prime is 664483711. The next prime is 664483759. The reversal of 664483731 is 137384466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664483731 - 2²⁹ = 127612819 is a prime.

It is a super-2 number, since 2×664483731² = 883077257527360722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664483711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34815 + ... + 50408.

It is an arithmetic number, because the mean of its divisors is an integer number (58293216).

Almost surely, 2^664483731 is an apocalyptic number.

664483731 is a deficient number, since it is larger than the sum of its proper divisors (268207725).

664483731 is a wasteful number, since it uses less digits than its factorization.

664483731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85362.

The product of its digits is 290304, while the sum is 42.

The square root of 664483731 is about 25777.5819463347. The cubic root of 664483731 is about 872.6259371637.

The spelling of 664483731 in words is "six hundred sixty-four million, four hundred eighty-three thousand, seven hundred thirty-one".