645661352 has 32 divisors (see below), whose sum is σ = 1385795520. Its totient is φ = 276264960.

The previous prime is 645661351. The next prime is 645661369. The reversal of 645661352 is 253166546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645661351) 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, 26903 + ... + 44889.

It is an arithmetic number, because the mean of its divisors is an integer number (43306110).

Almost surely, 2^645661352 is an apocalyptic number.

It is an amenable number.

645661352 is an abundant number, since it is smaller than the sum of its proper divisors (740134168).

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

645661352 is a wasteful number, since it uses less digits than its factorization.

645661352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18641 (or 18637 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 645661352 is about 25409.8672172839. The cubic root of 645661352 is about 864.3074644463.

The spelling of 645661352 in words is "six hundred forty-five million, six hundred sixty-one thousand, three hundred fifty-two".