1256733480 has 64 divisors (see below), whose sum is σ = 3857895360. Its totient is φ = 327333888.

The previous prime is 1256733479. The next prime is 1256733481. The reversal of 1256733480 is 843376521.

It is an interprime number because it is at equal distance from previous prime (1256733479) and next prime (1256733481).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1256733481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116617 + ... + 126936.

It is an arithmetic number, because the mean of its divisors is an integer number (60279615).

Almost surely, 2^1256733480 is an apocalyptic number.

1256733480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256733480 is an abundant number, since it is smaller than the sum of its proper divisors (2601161880).

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

1256733480 is a wasteful number, since it uses less digits than its factorization.

1256733480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243610 (or 243606 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 1256733480 is about 35450.4369507627. The cubic root of 1256733480 is about 1079.1481279709.

The spelling of 1256733480 in words is "one billion, two hundred fifty-six million, seven hundred thirty-three thousand, four hundred eighty".