642242030 has 16 divisors (see below), whose sum is σ = 1159092720. Its totient is φ = 256217472.

The previous prime is 642242021. The next prime is 642242039. The reversal of 642242030 is 30242246.

It is an interprime number because it is at equal distance from previous prime (642242021) and next prime (642242039).

It is a junction number, because it is equal to n+sod(n) for n = 642241987 and 642242005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642242039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80939 + ... + 88518.

It is an arithmetic number, because the mean of its divisors is an integer number (72443295).

Almost surely, 2^642242030 is an apocalyptic number.

642242030 is a deficient number, since it is larger than the sum of its proper divisors (516850690).

642242030 is a wasteful number, since it uses less digits than its factorization.

642242030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169843.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 642242030 is about 25342.4945496689. The cubic root of 642242030 is about 862.7790171991.

Adding to 642242030 its reverse (30242246), we get a palindrome (672484276).

The spelling of 642242030 in words is "six hundred forty-two million, two hundred forty-two thousand, thirty".