642402152 has 48 divisors (see below), whose sum is σ = 1405674720. Its totient is φ = 274428000.

The previous prime is 642402151. The next prime is 642402161. The reversal of 642402152 is 251204246.

It is a super-2 number, since 2×642402152² = 825361049788462208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642402151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127277 + ... + 132227.

It is an arithmetic number, because the mean of its divisors is an integer number (29284890).

Almost surely, 2^642402152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642402152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702837360).

642402152 is an abundant number, since it is smaller than the sum of its proper divisors (763272568).

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

642402152 is a wasteful number, since it uses less digits than its factorization.

642402152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5302 (or 5291 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 642402152 is about 25345.6535129793. The cubic root of 642402152 is about 862.8507131309.

Adding to 642402152 its reverse (251204246), we get a palindrome (893606398).

The spelling of 642402152 in words is "six hundred forty-two million, four hundred two thousand, one hundred fifty-two".