643382460 has 96 divisors (see below), whose sum is σ = 2287595520. Its totient is φ = 147057984.

The previous prime is 643382449. The next prime is 643382471. The reversal of 643382460 is 64283346.

It is a happy number.

643382460 is a `hidden beast` number, since 643 + 3 + 8 + 2 + 4 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (643382449) and next prime (643382471).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 81324 + ... + 88883.

It is an arithmetic number, because the mean of its divisors is an integer number (23829120).

Almost surely, 2^643382460 is an apocalyptic number.

643382460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643382460 is an abundant number, since it is smaller than the sum of its proper divisors (1644213060).

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

643382460 is a wasteful number, since it uses less digits than its factorization.

643382460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170232 (or 170224 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 643382460 is about 25364.9849201611. The cubic root of 643382460 is about 863.2893944964.

The spelling of 643382460 in words is "six hundred forty-three million, three hundred eighty-two thousand, four hundred sixty".