611643906 has 16 divisors (see below), whose sum is σ = 1359208800. Its totient is φ = 203881284.

The previous prime is 611643883. The next prime is 611643931. The reversal of 611643906 is 609346116.

611643906 is a `hidden beast` number, since 6 + 1 + 1 + 643 + 9 + 0 + 6 = 666.

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, 5663316 + ... + 5663423.

It is an arithmetic number, because the mean of its divisors is an integer number (84950550).

Almost surely, 2^611643906 is an apocalyptic number.

611643906 is an abundant number, since it is smaller than the sum of its proper divisors (747564894).

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

611643906 is a wasteful number, since it uses less digits than its factorization.

611643906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11326750 (or 11326744 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 611643906 is about 24731.4355830793. The cubic root of 611643906 is about 848.8537749641.

The spelling of 611643906 in words is "six hundred eleven million, six hundred forty-three thousand, nine hundred six".