642747222 has 36 divisors (see below), whose sum is σ = 1507991004. Its totient is φ = 197767440.

The previous prime is 642747197. The next prime is 642747223. The reversal of 642747222 is 222747246.

642747222 is a `hidden beast` number, since 6 + 427 + 4 + 7 + 222 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642747223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 102604 + ... + 108687.

It is an arithmetic number, because the mean of its divisors is an integer number (41888639).

Almost surely, 2^642747222 is an apocalyptic number.

642747222 is an abundant number, since it is smaller than the sum of its proper divisors (865243782).

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

642747222 is a wasteful number, since it uses less digits than its factorization.

642747222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211325 (or 211309 counting only the distinct ones).

The product of its digits is 75264, while the sum is 36.

The square root of 642747222 is about 25352.4598806506. The cubic root of 642747222 is about 863.0051805461.

The spelling of 642747222 in words is "six hundred forty-two million, seven hundred forty-seven thousand, two hundred twenty-two".