642636948 has 24 divisors (see below), whose sum is σ = 1503453280. Its totient is φ = 213645600.

The previous prime is 642636937. The next prime is 642636959. The reversal of 642636948 is 849636246.

642636948 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642636937) and next prime (642636959).

It is a junction number, because it is equal to n+sod(n) for n = 642636897 and 642636906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66103 + ... + 75198.

Almost surely, 2^642636948 is an apocalyptic number.

It is an amenable number.

642636948 is an abundant number, since it is smaller than the sum of its proper divisors (860816332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642636948 is a wasteful number, since it uses less digits than its factorization.

642636948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141687 (or 141685 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 48.

The square root of 642636948 is about 25350.2849688125. The cubic root of 642636948 is about 862.9558234153.

The spelling of 642636948 in words is "six hundred forty-two million, six hundred thirty-six thousand, nine hundred forty-eight".