642639348 has 36 divisors (see below), whose sum is σ = 1749408388. Its totient is φ = 197735040.

The previous prime is 642639329. The next prime is 642639353. The reversal of 642639348 is 843936246.

642639348 is a `hidden beast` number, since 6 + 4 + 2 + 639 + 3 + 4 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181764324 + 460875024 = 13482^2 + 21468^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686113 + ... + 687048.

Almost surely, 2^642639348 is an apocalyptic number.

It is an amenable number.

642639348 is an abundant number, since it is smaller than the sum of its proper divisors (1106769040).

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

642639348 is a wasteful number, since it uses less digits than its factorization.

642639348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373184 (or 1373179 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 642639348 is about 25350.3323055143. The cubic root of 642639348 is about 862.9568976825.

The spelling of 642639348 in words is "six hundred forty-two million, six hundred thirty-nine thousand, three hundred forty-eight".