642606246 has 48 divisors (see below), whose sum is σ = 1474596864. Its totient is φ = 201822192.

The previous prime is 642606227. The next prime is 642606247.

642606246 is a `hidden beast` number, since 6 + 4 + 2 + 606 + 2 + 46 = 666.

642606246 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 642606246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642606247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16155 + ... + 39321.

It is an arithmetic number, because the mean of its divisors is an integer number (30720768).

Almost surely, 2^642606246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642606246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737298432).

642606246 is an abundant number, since it is smaller than the sum of its proper divisors (831990618).

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

642606246 is a wasteful number, since it uses less digits than its factorization.

642606246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23265 (or 23262 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 642606246 is about 25349.6794062568. The cubic root of 642606246 is about 862.9420806160.

The spelling of 642606246 in words is "six hundred forty-two million, six hundred six thousand, two hundred forty-six".