10256378440 has 64 divisors (see below), whose sum is σ = 28771148160. Its totient is φ = 3196792320.

The previous prime is 10256378437. The next prime is 10256378441. The reversal of 10256378440 is 4487365201.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 10256378393 and 10256378402.

It is not an unprimeable number, because it can be changed into a prime (10256378441) 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, 1661917 + ... + 1668076.

It is an arithmetic number, because the mean of its divisors is an integer number (449549190).

Almost surely, 2^10256378440 is an apocalyptic number.

10256378440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10256378440 is an abundant number, since it is smaller than the sum of its proper divisors (18514769720).

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

10256378440 is a wasteful number, since it uses less digits than its factorization.

10256378440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330022 (or 3330018 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 10256378440 in words is "ten billion, two hundred fifty-six million, three hundred seventy-eight thousand, four hundred forty".