642102340 has 96 divisors (see below), whose sum is σ = 1602115200. Its totient is φ = 213534720.

The previous prime is 642102319. The next prime is 642102347. The reversal of 642102340 is 43201246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (642102347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118572 + ... + 123868.

It is an arithmetic number, because the mean of its divisors is an integer number (16688700).

Almost surely, 2^642102340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642102340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801057600).

642102340 is an abundant number, since it is smaller than the sum of its proper divisors (960012860).

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

642102340 is a wasteful number, since it uses less digits than its factorization.

642102340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365 (or 5363 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 642102340 is about 25339.7383569760. The cubic root of 642102340 is about 862.7164601286.

Adding to 642102340 its reverse (43201246), we get a palindrome (685303586).

The spelling of 642102340 in words is "six hundred forty-two million, one hundred two thousand, three hundred forty".