642115320 has 128 divisors (see below), whose sum is σ = 2401712640. Its totient is φ = 133424640.

The previous prime is 642115319. The next prime is 642115321. The reversal of 642115320 is 23511246.

It is an interprime number because it is at equal distance from previous prime (642115319) and next prime (642115321).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642115321) 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, 25507 + ... + 43986.

It is an arithmetic number, because the mean of its divisors is an integer number (18763380).

Almost surely, 2^642115320 is an apocalyptic number.

642115320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642115320 is an abundant number, since it is smaller than the sum of its proper divisors (1759597320).

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

642115320 is a wasteful number, since it uses less digits than its factorization.

642115320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69525 (or 69521 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 642115320 is about 25339.9944751375. The cubic root of 642115320 is about 862.7222733162.

Adding to 642115320 its reverse (23511246), we get a palindrome (665626566).

The spelling of 642115320 in words is "six hundred forty-two million, one hundred fifteen thousand, three hundred twenty".