642705219 has 64 divisors (see below), whose sum is σ = 1062476800. Its totient is φ = 381459456.

The previous prime is 642705209. The next prime is 642705227. The reversal of 642705219 is 912507246.

642705219 is a `hidden beast` number, since 64 + 2 + 70 + 521 + 9 = 666.

It is not a de Polignac number, because 642705219 - 2⁹ = 642704707 is a prime.

It is a super-2 number, since 2×642705219² = 826139997059675922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642705209) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1463802 + ... + 1464240.

It is an arithmetic number, because the mean of its divisors is an integer number (16601200).

Almost surely, 2^642705219 is an apocalyptic number.

642705219 is a deficient number, since it is larger than the sum of its proper divisors (419771581).

642705219 is a wasteful number, since it uses less digits than its factorization.

642705219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 642705219 is about 25351.6314859616. The cubic root of 642705219 is about 862.9863812448.

The spelling of 642705219 in words is "six hundred forty-two million, seven hundred five thousand, two hundred nineteen".