642042152 has 8 divisors (see below), whose sum is σ = 1203829050. Its totient is φ = 321021072.

The previous prime is 642042151. The next prime is 642042197. The reversal of 642042152 is 251240246.

It can be written as a sum of positive squares in only one way, i.e., 511031236 + 131010916 = 22606^2 + 11446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×642042152² = 824436249889582208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642042151) 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 as a sum of consecutive naturals, namely, 40127627 + ... + 40127642.

Almost surely, 2^642042152 is an apocalyptic number.

It is an amenable number.

642042152 is a deficient number, since it is larger than the sum of its proper divisors (561786898).

642042152 is a wasteful number, since it uses less digits than its factorization.

642042152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80255275 (or 80255271 counting only the distinct ones).

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

The square root of 642042152 is about 25338.5507083574. The cubic root of 642042152 is about 862.6895034699.

Adding to 642042152 its reverse (251240246), we get a palindrome (893282398).

The spelling of 642042152 in words is "six hundred forty-two million, forty-two thousand, one hundred fifty-two".