256421822 has 8 divisors (see below), whose sum is σ = 384868200. Its totient is φ = 128132424.

The previous prime is 256421819. The next prime is 256421827. The reversal of 256421822 is 228124652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256421827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35072 + ... + 41747.

It is an arithmetic number, because the mean of its divisors is an integer number (48108525).

Almost surely, 2^256421822 is an apocalyptic number.

256421822 is a deficient number, since it is larger than the sum of its proper divisors (128446378).

256421822 is a wasteful number, since it uses less digits than its factorization.

256421822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78490.

The product of its digits is 15360, while the sum is 32.

The square root of 256421822 is about 16013.1765118605. The cubic root of 256421822 is about 635.3089797698.

The spelling of 256421822 in words is "two hundred fifty-six million, four hundred twenty-one thousand, eight hundred twenty-two".