642649063 has 12 divisors (see below), whose sum is σ = 760245480. Its totient is φ = 541503312.

The previous prime is 642649057. The next prime is 642649097. The reversal of 642649063 is 360946246.

It is not a de Polignac number, because 642649063 - 2⁹ = 642648551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642649013) 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, 108256 + ... + 114037.

It is an arithmetic number, because the mean of its divisors is an integer number (63353790).

Almost surely, 2^642649063 is an apocalyptic number.

642649063 is a deficient number, since it is larger than the sum of its proper divisors (117596417).

642649063 is a wasteful number, since it uses less digits than its factorization.

642649063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222366 (or 222359 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 642649063 is about 25350.5239196353. The cubic root of 642649063 is about 862.9612461993.

The spelling of 642649063 in words is "six hundred forty-two million, six hundred forty-nine thousand, sixty-three".