642387334 has 4 divisors (see below), whose sum is σ = 963581004. Its totient is φ = 321193666.

The previous prime is 642387331. The next prime is 642387349. The reversal of 642387334 is 433783246.

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

It is a super-2 number, since 2×642387334² = 825322973767255112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642387331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160596832 + ... + 160596835.

It is an arithmetic number, because the mean of its divisors is an integer number (240895251).

Almost surely, 2^642387334 is an apocalyptic number.

642387334 is a deficient number, since it is larger than the sum of its proper divisors (321193670).

642387334 is a wasteful number, since it uses less digits than its factorization.

642387334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321193669.

The product of its digits is 290304, while the sum is 40.

The square root of 642387334 is about 25345.3611929284. The cubic root of 642387334 is about 862.8440787508.

The spelling of 642387334 in words is "six hundred forty-two million, three hundred eighty-seven thousand, three hundred thirty-four".