1256704870 has 16 divisors (see below), whose sum is σ = 2275147440. Its totient is φ = 499775584.

The previous prime is 1256704819. The next prime is 1256704871. The reversal of 1256704870 is 784076521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256704871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361480 + ... + 364939.

It is an arithmetic number, because the mean of its divisors is an integer number (142196715).

Almost surely, 2^1256704870 is an apocalyptic number.

1256704870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256704870 is a deficient number, since it is larger than the sum of its proper divisors (1018442570).

1256704870 is a wasteful number, since it uses less digits than its factorization.

1256704870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726599.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 1256704870 is about 35450.0334273467. The cubic root of 1256704870 is about 1079.1399388407.

The spelling of 1256704870 in words is "one billion, two hundred fifty-six million, seven hundred four thousand, eight hundred seventy".