643250802 has 16 divisors (see below), whose sum is σ = 1292601312. Its totient is φ = 213400320.

The previous prime is 643250779. The next prime is 643250819. The reversal of 643250802 is 208052346.

It is a self number, because there is not a number n which added to its sum of digits gives 643250802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252783 + ... + 255314.

It is an arithmetic number, because the mean of its divisors is an integer number (80787582).

Almost surely, 2^643250802 is an apocalyptic number.

643250802 is an abundant number, since it is smaller than the sum of its proper divisors (649350510).

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

643250802 is a wasteful number, since it uses less digits than its factorization.

643250802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508313.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 643250802 is about 25362.3895167628. The cubic root of 643250802 is about 863.2305043257.

The spelling of 643250802 in words is "six hundred forty-three million, two hundred fifty thousand, eight hundred two".