646454277 has 20 divisors (see below), whose sum is σ = 1103647776. Its totient is φ = 369402120.

The previous prime is 646454183. The next prime is 646454287. The reversal of 646454277 is 772454646.

It is not a de Polignac number, because 646454277 - 2⁸ = 646454021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646454287) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 569499 + ... + 570632.

Almost surely, 2^646454277 is an apocalyptic number.

It is an amenable number.

646454277 is a deficient number, since it is larger than the sum of its proper divisors (457193499).

646454277 is a wasteful number, since it uses less digits than its factorization.

646454277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140150 (or 1140141 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 45.

The square root of 646454277 is about 25425.4651284888. The cubic root of 646454277 is about 864.6611331498.

The spelling of 646454277 in words is "six hundred forty-six million, four hundred fifty-four thousand, two hundred seventy-seven".