642739516 has 6 divisors (see below), whose sum is σ = 1124794160. Its totient is φ = 321369756.

The previous prime is 642739501. The next prime is 642739541. The reversal of 642739516 is 615937246.

It is a super-2 number, since 2×642739516² = 826228170855828512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80342436 + ... + 80342443.

Almost surely, 2^642739516 is an apocalyptic number.

It is an amenable number.

642739516 is a deficient number, since it is larger than the sum of its proper divisors (482054644).

642739516 is a wasteful number, since it uses less digits than its factorization.

642739516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160684883 (or 160684881 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The square root of 642739516 is about 25352.3079028320. The cubic root of 642739516 is about 863.0017316296.

The spelling of 642739516 in words is "six hundred forty-two million, seven hundred thirty-nine thousand, five hundred sixteen".