1642523568 has 80 divisors (see below), whose sum is σ = 4870759680. Its totient is φ = 467221248.

The previous prime is 1642523557. The next prime is 1642523611. The reversal of 1642523568 is 8653252461.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66271 + ... + 87617.

It is an arithmetic number, because the mean of its divisors is an integer number (60884496).

Almost surely, 2^1642523568 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 1642523568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2435379840).

1642523568 is an abundant number, since it is smaller than the sum of its proper divisors (3228236112).

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

1642523568 is a wasteful number, since it uses less digits than its factorization.

1642523568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21594 (or 21588 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 1642523568 is about 40528.0590208808. The cubic root of 1642523568 is about 1179.8782714609.

It can be divided in two parts, 16425 and 23568, that added together give a palindrome (39993).

The spelling of 1642523568 in words is "one billion, six hundred forty-two million, five hundred twenty-three thousand, five hundred sixty-eight".