256673043740 has 48 divisors (see below), whose sum is σ = 556132681440. Its totient is φ = 99444433920.

The previous prime is 256673043721. The next prime is 256673043743. The reversal of 256673043740 is 47340376652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673043743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011977 + ... + 1239936.

It is an arithmetic number, because the mean of its divisors is an integer number (11586097530).

Almost surely, 2^256673043740 is an apocalyptic number.

256673043740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256673043740 is an abundant number, since it is smaller than the sum of its proper divisors (299459637700).

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

256673043740 is a wasteful number, since it uses less digits than its factorization.

256673043740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252102 (or 2252100 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 47.

The spelling of 256673043740 in words is "two hundred fifty-six billion, six hundred seventy-three million, forty-three thousand, seven hundred forty".