256490142340 has 48 divisors (see below), whose sum is σ = 546833774592. Its totient is φ = 101045097216.

The previous prime is 256490142313. The next prime is 256490142353. The reversal of 256490142340 is 43241094652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 256490142293 and 256490142302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20562 + ... + 716521.

It is an arithmetic number, because the mean of its divisors is an integer number (11392370304).

Almost surely, 2^256490142340 is an apocalyptic number.

256490142340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256490142340 is an abundant number, since it is smaller than the sum of its proper divisors (290343632252).

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

256490142340 is a wasteful number, since it uses less digits than its factorization.

256490142340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737356 (or 737354 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 256490142340 in words is "two hundred fifty-six billion, four hundred ninety million, one hundred forty-two thousand, three hundred forty".