642957002 has 4 divisors (see below), whose sum is σ = 964435506. Its totient is φ = 321478500.

The previous prime is 642957001. The next prime is 642957013. The reversal of 642957002 is 200759246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 420619081 + 222337921 = 20509^2 + 14911^2 .

It is not an unprimeable number, because it can be changed into a prime (642957001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160739249 + ... + 160739252.

Almost surely, 2^642957002 is an apocalyptic number.

642957002 is a deficient number, since it is larger than the sum of its proper divisors (321478504).

642957002 is a wasteful number, since it uses less digits than its factorization.

642957002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321478503.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 642957002 is about 25356.5968142415. The cubic root of 642957002 is about 863.0990596161.

The spelling of 642957002 in words is "six hundred forty-two million, nine hundred fifty-seven thousand, two".