642227040 has 576 divisors, whose sum is σ = 2806876800. Its totient is φ = 130830336.

The previous prime is 642227017. The next prime is 642227083. The reversal of 642227040 is 40722246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642226995 and 642227013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22145746 + ... + 22145774.

It is an arithmetic number, because the mean of its divisors is an integer number (4873050).

Almost surely, 2^642227040 is an apocalyptic number.

642227040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642227040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1403438400).

642227040 is an abundant number, since it is smaller than the sum of its proper divisors (2164649760).

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

642227040 is a wasteful number, since it uses less digits than its factorization.

642227040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 642227040 is about 25342.1987996306. The cubic root of 642227040 is about 862.7723046943.

Adding to 642227040 its reverse (40722246), we get a palindrome (682949286).

The spelling of 642227040 in words is "six hundred forty-two million, two hundred twenty-seven thousand, forty".