642215734 has 32 divisors (see below), whose sum is σ = 1013031360. Its totient is φ = 305016192.

The previous prime is 642215731. The next prime is 642215741. The reversal of 642215734 is 437512246.

It is a self number, because there is not a number n which added to its sum of digits gives 642215734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642215731) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1462687 + ... + 1463125.

It is an arithmetic number, because the mean of its divisors is an integer number (31657230).

Almost surely, 2^642215734 is an apocalyptic number.

642215734 is a deficient number, since it is larger than the sum of its proper divisors (370815626).

642215734 is a wasteful number, since it uses less digits than its factorization.

642215734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

The product of its digits is 40320, while the sum is 34.

The square root of 642215734 is about 25341.9757319748. The cubic root of 642215734 is about 862.7672418114.

The spelling of 642215734 in words is "six hundred forty-two million, two hundred fifteen thousand, seven hundred thirty-four".