1256036020 has 24 divisors (see below), whose sum is σ = 2699018784. Its totient is φ = 490730016.

The previous prime is 1256035987. The next prime is 1256036053. The reversal of 1256036020 is 206306521.

It is an interprime number because it is at equal distance from previous prime (1256035987) and next prime (1256036053).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729394 + ... + 731113.

It is an arithmetic number, because the mean of its divisors is an integer number (112459116).

Almost surely, 2^1256036020 is an apocalyptic number.

1256036020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256036020 is an abundant number, since it is smaller than the sum of its proper divisors (1442982764).

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

1256036020 is a wasteful number, since it uses less digits than its factorization.

1256036020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460559 (or 1460557 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1256036020 is about 35440.5984712448. The cubic root of 1256036020 is about 1078.9484563764.

The spelling of 1256036020 in words is "one billion, two hundred fifty-six million, thirty-six thousand, twenty".