642215730434 has 8 divisors (see below), whose sum is σ = 964381033728. Its totient is φ = 320755385860.

The previous prime is 642215730433. The next prime is 642215730463. The reversal of 642215730434 is 434037512246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642215730391 and 642215730400.

It is not an unprimeable number, because it can be changed into a prime (642215730433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176237402 + ... + 176241045.

It is an arithmetic number, because the mean of its divisors is an integer number (120547629216).

Almost surely, 2^642215730434 is an apocalyptic number.

642215730434 is a deficient number, since it is larger than the sum of its proper divisors (322165303294).

642215730434 is a wasteful number, since it uses less digits than its factorization.

642215730434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352479360.

The product of its (nonzero) digits is 483840, while the sum is 41.

The spelling of 642215730434 in words is "six hundred forty-two billion, two hundred fifteen million, seven hundred thirty thousand, four hundred thirty-four".