1217283456 has 64 divisors (see below), whose sum is σ = 3302254080. Its totient is φ = 397122048.

The previous prime is 1217283449. The next prime is 1217283493. The reversal of 1217283456 is 6543827121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15676 + ... + 51771.

It is an arithmetic number, because the mean of its divisors is an integer number (51597720).

Almost surely, 2^1217283456 is an apocalyptic number.

1217283456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1217283456 is an abundant number, since it is smaller than the sum of its proper divisors (2084970624).

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

1217283456 is an equidigital number, since it uses as much as digits as its factorization.

1217283456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67511 (or 67499 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 1217283456 is about 34889.5895074734. The cubic root of 1217283456 is about 1067.7360511436.

The spelling of 1217283456 in words is "one billion, two hundred seventeen million, two hundred eighty-three thousand, four hundred fifty-six".