642735570 has 32 divisors (see below), whose sum is σ = 1554720768. Its totient is φ = 170045568.

The previous prime is 642735563. The next prime is 642735571. The reversal of 642735570 is 75537246.

It is not an unprimeable number, because it can be changed into a prime (642735571) 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, 80539 + ... + 88158.

It is an arithmetic number, because the mean of its divisors is an integer number (48585024).

Almost surely, 2^642735570 is an apocalyptic number.

642735570 is an abundant number, since it is smaller than the sum of its proper divisors (911985198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642735570 is a wasteful number, since it uses less digits than its factorization.

642735570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168834.

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 642735570 is about 25352.2300794230. The cubic root of 642735570 is about 862.9999655374. Note that the first 4 decimals are identical.

The spelling of 642735570 in words is "six hundred forty-two million, seven hundred thirty-five thousand, five hundred seventy".