662664636 has 72 divisors (see below), whose sum is σ = 1720882800. Its totient is φ = 214924800.

The previous prime is 662664631. The next prime is 662664637. The reversal of 662664636 is 636466266.

662664636 is a `hidden beast` number, since 6 + 6 + 2 + 6 + 6 + 4 + 636 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 662664591 and 662664600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662664631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212980 + ... + 216068.

It is an arithmetic number, because the mean of its divisors is an integer number (23901150).

Almost surely, 2^662664636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 662664636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860441400).

662664636 is an abundant number, since it is smaller than the sum of its proper divisors (1058218164).

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

662664636 is a wasteful number, since it uses less digits than its factorization.

662664636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259 (or 3254 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 45.

The square root of 662664636 is about 25742.2733261847. The cubic root of 662664636 is about 871.8289072484.

The spelling of 662664636 in words is "six hundred sixty-two million, six hundred sixty-four thousand, six hundred thirty-six".