642417740 has 24 divisors (see below), whose sum is σ = 1420082160. Its totient is φ = 243442368.

The previous prime is 642417707. The next prime is 642417749. The reversal of 642417740 is 47714246.

It is a self number, because there is not a number n which added to its sum of digits gives 642417740.

It is not an unprimeable number, because it can be changed into a prime (642417749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844907 + ... + 845666.

It is an arithmetic number, because the mean of its divisors is an integer number (59170090).

Almost surely, 2^642417740 is an apocalyptic number.

It is an amenable number.

642417740 is an abundant number, since it is smaller than the sum of its proper divisors (777664420).

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

642417740 is a wasteful number, since it uses less digits than its factorization.

642417740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690601 (or 1690599 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 642417740 is about 25345.9610194603. The cubic root of 642417740 is about 862.8576921487.

The spelling of 642417740 in words is "six hundred forty-two million, four hundred seventeen thousand, seven hundred forty".