255640422 has 8 divisors (see below), whose sum is σ = 511280856. Its totient is φ = 85213472.

The previous prime is 255640417. The next prime is 255640457. The reversal of 255640422 is 224046552.

It is a happy number.

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

255640422 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 255640422.

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, 21303363 + ... + 21303374.

It is an arithmetic number, because the mean of its divisors is an integer number (63910107).

Almost surely, 2^255640422 is an apocalyptic number.

255640422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

255640422 is a wasteful number, since it uses less digits than its factorization.

255640422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42606742.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 255640422 is about 15988.7592389153. The cubic root of 255640422 is about 634.6629926881.

Adding to 255640422 its reverse (224046552), we get a palindrome (479686974).

The spelling of 255640422 in words is "two hundred fifty-five million, six hundred forty thousand, four hundred twenty-two".