643072452 has 48 divisors (see below), whose sum is σ = 1638487872. Its totient is φ = 194682880.

The previous prime is 643072421. The next prime is 643072483. The reversal of 643072452 is 254270346.

It is an interprime number because it is at equal distance from previous prime (643072421) and next prime (643072483).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203428 + ... + 206564.

It is an arithmetic number, because the mean of its divisors is an integer number (34135164).

Almost surely, 2^643072452 is an apocalyptic number.

It is an amenable number.

643072452 is an abundant number, since it is smaller than the sum of its proper divisors (995415420).

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

643072452 is a wasteful number, since it uses less digits than its factorization.

643072452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708 (or 4706 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 643072452 is about 25358.8732399529. The cubic root of 643072452 is about 863.1507161668.

The spelling of 643072452 in words is "six hundred forty-three million, seventy-two thousand, four hundred fifty-two".