642447102 has 64 divisors (see below), whose sum is σ = 1499710464. Its totient is φ = 181309440.

The previous prime is 642447097. The next prime is 642447107. The reversal of 642447102 is 201744246.

It is an interprime number because it is at equal distance from previous prime (642447097) and next prime (642447107).

It is a self number, because there is not a number n which added to its sum of digits gives 642447102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642447107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105883 + ... + 111785.

It is an arithmetic number, because the mean of its divisors is an integer number (23432976).

Almost surely, 2^642447102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642447102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749855232).

642447102 is an abundant number, since it is smaller than the sum of its proper divisors (857263362).

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

642447102 is a wasteful number, since it uses less digits than its factorization.

642447102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6033.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 642447102 is about 25346.5402372789. The cubic root of 642447102 is about 862.8708377184.

It can be divided in two parts, 642 and 447102, that added together give a palindrome (447744).

The spelling of 642447102 in words is "six hundred forty-two million, four hundred forty-seven thousand, one hundred two".