646622776 has 8 divisors (see below), whose sum is σ = 1212417720. Its totient is φ = 323311384.

The previous prime is 646622749. The next prime is 646622789. The reversal of 646622776 is 677226646.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40413916 + ... + 40413931.

It is an arithmetic number, because the mean of its divisors is an integer number (151552215).

Almost surely, 2^646622776 is an apocalyptic number.

It is an amenable number.

646622776 is a deficient number, since it is larger than the sum of its proper divisors (565794944).

646622776 is a wasteful number, since it uses less digits than its factorization.

646622776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80827853 (or 80827849 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 46.

The square root of 646622776 is about 25428.7784999595. The cubic root of 646622776 is about 864.7362515740.

The spelling of 646622776 in words is "six hundred forty-six million, six hundred twenty-two thousand, seven hundred seventy-six".