646626283 has 4 divisors (see below), whose sum is σ = 648127008. Its totient is φ = 645125560.

The previous prime is 646626271. The next prime is 646626287. The reversal of 646626283 is 382626646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 382626646 = 2 ⋅191313323.

It is a cyclic number.

It is not a de Polignac number, because 646626283 - 2⁵ = 646626251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646626287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749716 + ... + 750577.

It is an arithmetic number, because the mean of its divisors is an integer number (162031752).

Almost surely, 2^646626283 is an apocalyptic number.

646626283 is a deficient number, since it is larger than the sum of its proper divisors (1500725).

646626283 is a wasteful number, since it uses less digits than its factorization.

646626283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500724.

The product of its digits is 497664, while the sum is 43.

The square root of 646626283 is about 25428.8474571696. The cubic root of 646626283 is about 864.7378148886.

The spelling of 646626283 in words is "six hundred forty-six million, six hundred twenty-six thousand, two hundred eighty-three".