642365882 has 4 divisors (see below), whose sum is σ = 963548826. Its totient is φ = 321182940.

The previous prime is 642365881. The next prime is 642365939. The reversal of 642365882 is 288563246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 288563246 = 2 ⋅144281623.

It can be written as a sum of positive squares in only one way, i.e., 546110161 + 96255721 = 23369^2 + 9811^2 .

It is not an unprimeable number, because it can be changed into a prime (642365881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160591469 + ... + 160591472.

Almost surely, 2^642365882 is an apocalyptic number.

642365882 is a deficient number, since it is larger than the sum of its proper divisors (321182944).

642365882 is a wasteful number, since it uses less digits than its factorization.

642365882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321182943.

The product of its digits is 552960, while the sum is 44.

The square root of 642365882 is about 25344.9379955840. The cubic root of 642365882 is about 862.8344739863.

The spelling of 642365882 in words is "six hundred forty-two million, three hundred sixty-five thousand, eight hundred eighty-two".