643577402 has 16 divisors (see below), whose sum is σ = 1046516352. Its totient is φ = 295066800.

The previous prime is 643577401. The next prime is 643577413. The reversal of 643577402 is 204775346.

643577402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643577401) 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, 78038 + ... + 85889.

It is an arithmetic number, because the mean of its divisors is an integer number (65407272).

Almost surely, 2^643577402 is an apocalyptic number.

643577402 is a deficient number, since it is larger than the sum of its proper divisors (402938950).

643577402 is a wasteful number, since it uses less digits than its factorization.

643577402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164093.

The product of its (nonzero) digits is 141120, while the sum is 38.

The square root of 643577402 is about 25368.8273674602. The cubic root of 643577402 is about 863.3765766301.

The spelling of 643577402 in words is "six hundred forty-three million, five hundred seventy-seven thousand, four hundred two".