642315542 has 8 divisors (see below), whose sum is σ = 1051061832. Its totient is φ = 291961600.

The previous prime is 642315517. The next prime is 642315571. The reversal of 642315542 is 245513246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642315499 and 642315508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14598059 + ... + 14598102.

It is an arithmetic number, because the mean of its divisors is an integer number (131382729).

Almost surely, 2^642315542 is an apocalyptic number.

642315542 is a deficient number, since it is larger than the sum of its proper divisors (408746290).

642315542 is a wasteful number, since it uses less digits than its factorization.

642315542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29196174.

The product of its digits is 28800, while the sum is 32.

The square root of 642315542 is about 25343.9448784123. The cubic root of 642315542 is about 862.8119342763.

Adding to 642315542 its reverse (245513246), we get a palindrome (887828788).

The spelling of 642315542 in words is "six hundred forty-two million, three hundred fifteen thousand, five hundred forty-two".