642405246 has 64 divisors (see below), whose sum is σ = 1500291072. Its totient is φ = 179590752.

The previous prime is 642405199. The next prime is 642405271. The reversal of 642405246 is 642504246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 469255 + ... + 470621.

It is an arithmetic number, because the mean of its divisors is an integer number (23442048).

Almost surely, 2^642405246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642405246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750145536).

642405246 is an abundant number, since it is smaller than the sum of its proper divisors (857885826).

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

642405246 is a wasteful number, since it uses less digits than its factorization.

642405246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613.

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 642405246 is about 25345.7145490120. The cubic root of 642405246 is about 862.8520983773.

The spelling of 642405246 in words is "six hundred forty-two million, four hundred five thousand, two hundred forty-six".