1256315770 has 16 divisors (see below), whose sum is σ = 2283760008. Its totient is φ = 497550400.

The previous prime is 1256315741. The next prime is 1256315779. The reversal of 1256315770 is 775136521.

It can be written as a sum of positive squares in 4 ways, for example, as 1139265009 + 117050761 = 33753^2 + 10819^2 .

It is not an unprimeable number, because it can be changed into a prime (1256315779) 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, 620929 + ... + 622948.

Almost surely, 2^1256315770 is an apocalyptic number.

1256315770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256315770 is a deficient number, since it is larger than the sum of its proper divisors (1027444238).

1256315770 is a wasteful number, since it uses less digits than its factorization.

1256315770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243985.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 1256315770 is about 35444.5449963743. The cubic root of 1256315770 is about 1079.0285531835.

The spelling of 1256315770 in words is "one billion, two hundred fifty-six million, three hundred fifteen thousand, seven hundred seventy".