642312330 has 32 divisors (see below), whose sum is σ = 1681691328. Its totient is φ = 155712000.

The previous prime is 642312289. The next prime is 642312331. The reversal of 642312330 is 33213246.

It is a self number, because there is not a number n which added to its sum of digits gives 642312330.

It is not an unprimeable number, because it can be changed into a prime (642312331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 972871 + ... + 973530.

It is an arithmetic number, because the mean of its divisors is an integer number (52552854).

Almost surely, 2^642312330 is an apocalyptic number.

642312330 is an abundant number, since it is smaller than the sum of its proper divisors (1039378998).

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

642312330 is a wasteful number, since it uses less digits than its factorization.

642312330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946422.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 642312330 is about 25343.8815101397. The cubic root of 642312330 is about 862.8104960649.

Adding to 642312330 its reverse (33213246), we get a palindrome (675525576).

The spelling of 642312330 in words is "six hundred forty-two million, three hundred twelve thousand, three hundred thirty".