256622512740 has 96 divisors (see below), whose sum is σ = 784910407680. Its totient is φ = 62128560000.

The previous prime is 256622512733. The next prime is 256622512771. The reversal of 256622512740 is 47215226652.

It is a super-2 number, since 2×256622512740² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256622512692 and 256622512701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236791 + ... + 754529.

It is an arithmetic number, because the mean of its divisors is an integer number (8176150080).

Almost surely, 2^256622512740 is an apocalyptic number.

256622512740 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 256622512740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392455203840).

256622512740 is an abundant number, since it is smaller than the sum of its proper divisors (528287894940).

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

256622512740 is a wasteful number, since it uses less digits than its factorization.

256622512740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518513 (or 518511 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 256622512740 in words is "two hundred fifty-six billion, six hundred twenty-two million, five hundred twelve thousand, seven hundred forty".