1256776530 has 16 divisors (see below), whose sum is σ = 3016263744. Its totient is φ = 335140400.

The previous prime is 1256776529. The next prime is 1256776531. The reversal of 1256776530 is 356776521.

1256776530 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1256776529) and next prime (1256776531).

It is not an unprimeable number, because it can be changed into a prime (1256776531) 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, 20946246 + ... + 20946305.

It is an arithmetic number, because the mean of its divisors is an integer number (188516484).

Almost surely, 2^1256776530 is an apocalyptic number.

1256776530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256776530 is an abundant number, since it is smaller than the sum of its proper divisors (1759487214).

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

1256776530 is a wasteful number, since it uses less digits than its factorization.

1256776530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41892561.

The product of its (nonzero) digits is 264600, while the sum is 42.

The square root of 1256776530 is about 35451.0441313087. The cubic root of 1256776530 is about 1079.1604500734.

Subtracting from 1256776530 its reverse (356776521), we obtain a palindrome (900000009).

The spelling of 1256776530 in words is "one billion, two hundred fifty-six million, seven hundred seventy-six thousand, five hundred thirty".