665624736 has 192 divisors, whose sum is σ = 2236066560. Its totient is φ = 188697600.

The previous prime is 665624719. The next prime is 665624747. The reversal of 665624736 is 637426566.

It is a junction number, because it is equal to n+sod(n) for n = 665624691 and 665624700.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 949186 + ... + 949886.

It is an arithmetic number, because the mean of its divisors is an integer number (11646180).

Almost surely, 2^665624736 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 665624736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118033280).

665624736 is an abundant number, since it is smaller than the sum of its proper divisors (1570441824).

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

665624736 is a wasteful number, since it uses less digits than its factorization.

665624736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 870 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 45.

The square root of 665624736 is about 25799.7041843506. The cubic root of 665624736 is about 873.1251222982.

The spelling of 665624736 in words is "six hundred sixty-five million, six hundred twenty-four thousand, seven hundred thirty-six".