646342623 has 12 divisors (see below), whose sum is σ = 933826608. Its totient is φ = 430793280.

The previous prime is 646342621. The next prime is 646342639. The reversal of 646342623 is 326243646.

646342623 is a `hidden beast` number, since 646 + 3 + 4 + 2 + 6 + 2 + 3 = 666.

It is not a de Polignac number, because 646342623 - 2¹ = 646342621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646342621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68286 + ... + 77172.

It is an arithmetic number, because the mean of its divisors is an integer number (77818884).

Almost surely, 2^646342623 is an apocalyptic number.

646342623 is a deficient number, since it is larger than the sum of its proper divisors (287483985).

646342623 is a wasteful number, since it uses less digits than its factorization.

646342623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974 (or 16971 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 646342623 is about 25423.2693216274. The cubic root of 646342623 is about 864.6113495656.

The spelling of 646342623 in words is "six hundred forty-six million, three hundred forty-two thousand, six hundred twenty-three".