256402332040 has 128 divisors (see below), whose sum is σ = 638433861120. Its totient is φ = 92181196800.

The previous prime is 256402332013. The next prime is 256402332047. The reversal of 256402332040 is 40233204652.

It is a junction number, because it is equal to n+sod(n) for n = 256402331993 and 256402332011.

It is not an unprimeable number, because it can be changed into a prime (256402332047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9855850 + ... + 9881830.

It is an arithmetic number, because the mean of its divisors is an integer number (4987764540).

Almost surely, 2^256402332040 is an apocalyptic number.

256402332040 is a gapful number since it is divisible by the number (20) 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 256402332040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319216930560).

256402332040 is an abundant number, since it is smaller than the sum of its proper divisors (382031529080).

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

256402332040 is a wasteful number, since it uses less digits than its factorization.

256402332040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26663 (or 26659 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 256402332040 its reverse (40233204652), we get a palindrome (296635536692).

The spelling of 256402332040 in words is "two hundred fifty-six billion, four hundred two million, three hundred thirty-two thousand, forty".