642220242 has 16 divisors (see below), whose sum is σ = 1325874432. Its totient is φ = 207167760.

The previous prime is 642220213. The next prime is 642220277. The reversal of 642220242 is 242022246.

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, 1726213 + ... + 1726584.

It is an arithmetic number, because the mean of its divisors is an integer number (82867152).

Almost surely, 2^642220242 is an apocalyptic number.

642220242 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

642220242 is an abundant number, since it is smaller than the sum of its proper divisors (683654190).

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

642220242 is a wasteful number, since it uses less digits than its factorization.

642220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452833.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 642220242 is about 25342.0646751602. The cubic root of 642220242 is about 862.7692605233.

Adding to 642220242 its reverse (242022246), we get a palindrome (884242488).

The spelling of 642220242 in words is "six hundred forty-two million, two hundred twenty thousand, two hundred forty-two".