642340542 has 16 divisors (see below), whose sum is σ = 1285270272. Its totient is φ = 214015320.

The previous prime is 642340519. The next prime is 642340613. The reversal of 642340542 is 245043246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9684 + ... + 37127.

It is an arithmetic number, because the mean of its divisors is an integer number (80329392).

Almost surely, 2^642340542 is an apocalyptic number.

642340542 is an abundant number, since it is smaller than the sum of its proper divisors (642929730).

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

642340542 is a wasteful number, since it uses less digits than its factorization.

642340542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49103.

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 642340542 is about 25344.4380880697. The cubic root of 642340542 is about 862.8231281611.

Adding to 642340542 its reverse (245043246), we get a palindrome (887383788).

The spelling of 642340542 in words is "six hundred forty-two million, three hundred forty thousand, five hundred forty-two".