642052402 has 16 divisors (see below), whose sum is σ = 997527960. Its totient is φ = 309570688.

The previous prime is 642052343. The next prime is 642052403. The reversal of 642052402 is 204250246.

It can be written as a sum of positive squares in 4 ways, for example, as 635493681 + 6558721 = 25209^2 + 2561^2 .

It is not an unprimeable number, because it can be changed into a prime (642052403) 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 7 ways as a sum of consecutive naturals, for example, 43248 + ... + 56164.

Almost surely, 2^642052402 is an apocalyptic number.

642052402 is a deficient number, since it is larger than the sum of its proper divisors (355475558).

642052402 is a wasteful number, since it uses less digits than its factorization.

642052402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13805.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 642052402 is about 25338.7529685263. The cubic root of 642052402 is about 862.6940943006.

The spelling of 642052402 in words is "six hundred forty-two million, fifty-two thousand, four hundred two".