642716782 has 4 divisors (see below), whose sum is σ = 964075176. Its totient is φ = 321358390.

The previous prime is 642716777. The next prime is 642716783. The reversal of 642716782 is 287617246.

642716782 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642716783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160679194 + ... + 160679197.

It is an arithmetic number, because the mean of its divisors is an integer number (241018794).

Almost surely, 2^642716782 is an apocalyptic number.

642716782 is a deficient number, since it is larger than the sum of its proper divisors (321358394).

642716782 is a wasteful number, since it uses less digits than its factorization.

642716782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321358393.

The product of its digits is 225792, while the sum is 43.

The square root of 642716782 is about 25351.8595373199. The cubic root of 642716782 is about 862.9915565835.

The spelling of 642716782 in words is "six hundred forty-two million, seven hundred sixteen thousand, seven hundred eighty-two".