664400737 has 16 divisors (see below), whose sum is σ = 892063872. Its totient is φ = 477889920.

The previous prime is 664400717. The next prime is 664400741. The reversal of 664400737 is 737004466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664400737 is a prime.

It is a super-2 number, since 2×664400737² = 882856678652286338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664400696 and 664400705.

It is not an unprimeable number, because it can be changed into a prime (664400717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330868 + ... + 332869.

It is an arithmetic number, because the mean of its divisors is an integer number (55753992).

Almost surely, 2^664400737 is an apocalyptic number.

It is an amenable number.

664400737 is a deficient number, since it is larger than the sum of its proper divisors (227663135).

664400737 is a wasteful number, since it uses less digits than its factorization.

664400737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663768.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 664400737 is about 25775.9720864219. The cubic root of 664400737 is about 872.5896053324.

The spelling of 664400737 in words is "six hundred sixty-four million, four hundred thousand, seven hundred thirty-seven".