642613775 has 12 divisors (see below), whose sum is σ = 797443752. Its totient is φ = 513702240.

The previous prime is 642613733. The next prime is 642613861. The reversal of 642613775 is 577316246.

It is not a de Polignac number, because 642613775 - 2¹² = 642609679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26669 + ... + 44681.

It is an arithmetic number, because the mean of its divisors is an integer number (66453646).

Almost surely, 2^642613775 is an apocalyptic number.

642613775 is a deficient number, since it is larger than the sum of its proper divisors (154829977).

642613775 is a wasteful number, since it uses less digits than its factorization.

642613775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19450 (or 19445 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 642613775 is about 25349.8279086861. The cubic root of 642613775 is about 862.9454507802.

The spelling of 642613775 in words is "six hundred forty-two million, six hundred thirteen thousand, seven hundred seventy-five".