642695142 has 16 divisors (see below), whose sum is σ = 1307177280. Its totient is φ = 210600552.

The previous prime is 642695117. The next prime is 642695161. The reversal of 642695142 is 241596246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642695142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907408 + ... + 908115.

It is an arithmetic number, because the mean of its divisors is an integer number (81698580).

Almost surely, 2^642695142 is an apocalyptic number.

642695142 is an abundant number, since it is smaller than the sum of its proper divisors (664482138).

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

642695142 is a wasteful number, since it uses less digits than its factorization.

642695142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815587.

The product of its digits is 103680, while the sum is 39.

The square root of 642695142 is about 25351.4327405770. The cubic root of 642695142 is about 862.9818709556.

The spelling of 642695142 in words is "six hundred forty-two million, six hundred ninety-five thousand, one hundred forty-two".