640240622 has 8 divisors (see below), whose sum is σ = 1097555376. Its totient is φ = 274388832.

The previous prime is 640240591. The next prime is 640240639. The reversal of 640240622 is 226042046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×640240622³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640240591 and 640240600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22865723 + ... + 22865750.

It is an arithmetic number, because the mean of its divisors is an integer number (137194422).

Almost surely, 2^640240622 is an apocalyptic number.

640240622 is a deficient number, since it is larger than the sum of its proper divisors (457314754).

640240622 is a wasteful number, since it uses less digits than its factorization.

640240622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45731482.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 640240622 is about 25302.9765442724. The cubic root of 640240622 is about 861.8818633938.

Adding to 640240622 its reverse (226042046), we get a palindrome (866282668).

The spelling of 640240622 in words is "six hundred forty million, two hundred forty thousand, six hundred twenty-two".