640352 has 12 divisors (see below), whose sum is σ = 1260756. Its totient is φ = 320160.

The previous prime is 640333. The next prime is 640363. The reversal of 640352 is 253046.

640352 is a modest number, since divided by 352 gives 64 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640352.

It is an unprimeable number.

640352 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974 + ... + 10037.

It is an arithmetic number, because the mean of its divisors is an integer number (105063).

2⁶⁴⁰³⁵² is an apocalyptic number.

It is an amenable number.

640352 is a deficient number, since it is larger than the sum of its proper divisors (620404).

640352 is a wasteful number, since it uses less digits than its factorization.

640352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20021 (or 20013 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 640352 is about 800.2199697583. The cubic root of 640352 is about 86.1931838934.

Adding to 640352 its reverse (253046), we get a palindrome (893398).

The spelling of 640352 in words is "six hundred forty thousand, three hundred fifty-two".