256422240 has 96 divisors (see below), whose sum is σ = 897492960. Its totient is φ = 68378112.

The previous prime is 256422217. The next prime is 256422253. The reversal of 256422240 is 42224652.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25359 + ... + 33998.

It is an arithmetic number, because the mean of its divisors is an integer number (9348885).

Almost surely, 2^256422240 is an apocalyptic number.

256422240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256422240 is an abundant number, since it is smaller than the sum of its proper divisors (641070720).

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

256422240 is a wasteful number, since it uses less digits than its factorization.

256422240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59381 (or 59367 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 256422240 is about 16013.1895636066. The cubic root of 256422240 is about 635.3093249809.

Adding to 256422240 its reverse (42224652), we get a palindrome (298646892).

The spelling of 256422240 in words is "two hundred fifty-six million, four hundred twenty-two thousand, two hundred forty".