664538622 has 16 divisors (see below), whose sum is σ = 1449902592. Its totient is φ = 201375320.

The previous prime is 664538617. The next prime is 664538627. The reversal of 664538622 is 226835466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664538617) and next prime (664538627).

It is a super-2 number, since 2×664538622² = 883223160259317768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664538627) 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, 5034318 + ... + 5034449.

It is an arithmetic number, because the mean of its divisors is an integer number (90618912).

Almost surely, 2^664538622 is an apocalyptic number.

664538622 is an abundant number, since it is smaller than the sum of its proper divisors (785363970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664538622 is a wasteful number, since it uses less digits than its factorization.

664538622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068783.

The product of its digits is 414720, while the sum is 42.

The square root of 664538622 is about 25778.6466285567. The cubic root of 664538622 is about 872.6499648358.

The spelling of 664538622 in words is "six hundred sixty-four million, five hundred thirty-eight thousand, six hundred twenty-two".