664623740 has 48 divisors (see below), whose sum is σ = 1575110880. Its totient is φ = 233345280.

The previous prime is 664623737. The next prime is 664623749. The reversal of 664623740 is 47326466.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 664623694 and 664623703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664623749) 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, 45707 + ... + 58466.

It is an arithmetic number, because the mean of its divisors is an integer number (32814810).

Almost surely, 2^664623740 is an apocalyptic number.

It is an amenable number.

664623740 is an abundant number, since it is smaller than the sum of its proper divisors (910487140).

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

664623740 is a wasteful number, since it uses less digits than its factorization.

664623740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104222 (or 104220 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 664623740 is about 25780.2975157386. The cubic root of 664623740 is about 872.6872212851.

The spelling of 664623740 in words is "six hundred sixty-four million, six hundred twenty-three thousand, seven hundred forty".