643091086 has 32 divisors (see below), whose sum is σ = 1100107008. Its totient is φ = 279090240.

The previous prime is 643091077. The next prime is 643091149. The reversal of 643091086 is 680190346.

It is a super-2 number, since 2×643091086² = 827132289785318792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432901 + ... + 434383.

It is an arithmetic number, because the mean of its divisors is an integer number (34378344).

Almost surely, 2^643091086 is an apocalyptic number.

643091086 is a deficient number, since it is larger than the sum of its proper divisors (457015922).

643091086 is a wasteful number, since it uses less digits than its factorization.

643091086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 643091086 is about 25359.2406432054. The cubic root of 643091086 is about 863.1590531202.

The spelling of 643091086 in words is "six hundred forty-three million, ninety-one thousand, eighty-six".