646943654 has 16 divisors (see below), whose sum is σ = 1167417600. Its totient is φ = 262668744.

The previous prime is 646943641. The next prime is 646943663. The reversal of 646943654 is 456349646.

It is a junction number, because it is equal to n+sod(n) for n = 646943599 and 646943608.

It is a congruent number.

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, 1215794 + ... + 1216325.

It is an arithmetic number, because the mean of its divisors is an integer number (72963600).

Almost surely, 2^646943654 is an apocalyptic number.

646943654 is a deficient number, since it is larger than the sum of its proper divisors (520473946).

646943654 is a wasteful number, since it uses less digits than its factorization.

646943654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432147.

The product of its digits is 1866240, while the sum is 47.

The square root of 646943654 is about 25435.0870649188. The cubic root of 646943654 is about 864.8792658960.

The spelling of 646943654 in words is "six hundred forty-six million, nine hundred forty-three thousand, six hundred fifty-four".