642542158 has 8 divisors (see below), whose sum is σ = 979613640. Its totient is φ = 316004280.

The previous prime is 642542137. The next prime is 642542189. The reversal of 642542158 is 851245246.

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

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, 2633248 + ... + 2633491.

It is an arithmetic number, because the mean of its divisors is an integer number (122451705).

Almost surely, 2^642542158 is an apocalyptic number.

642542158 is a deficient number, since it is larger than the sum of its proper divisors (337071482).

642542158 is a wasteful number, since it uses less digits than its factorization.

642542158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266802.

The product of its digits is 76800, while the sum is 37.

The square root of 642542158 is about 25348.4152956353. The cubic root of 642542158 is about 862.9133921976.

The spelling of 642542158 in words is "six hundred forty-two million, five hundred forty-two thousand, one hundred fifty-eight".