1256378782 has 4 divisors (see below), whose sum is σ = 1884568176. Its totient is φ = 628189390.

The previous prime is 1256378777. The next prime is 1256378797. The reversal of 1256378782 is 2878736521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2878736521 = 36541 ⋅78781.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314094694 + ... + 314094697.

It is an arithmetic number, because the mean of its divisors is an integer number (471142044).

Almost surely, 2^1256378782 is an apocalyptic number.

1256378782 is a deficient number, since it is larger than the sum of its proper divisors (628189394).

1256378782 is an equidigital number, since it uses as much as digits as its factorization.

1256378782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628189393.

The product of its digits is 1128960, while the sum is 49.

The square root of 1256378782 is about 35445.4338667197. The cubic root of 1256378782 is about 1079.0465928654.

The spelling of 1256378782 in words is "one billion, two hundred fifty-six million, three hundred seventy-eight thousand, seven hundred eighty-two".