1217506680 has 256 divisors, whose sum is σ = 4628534400. Its totient is φ = 282009600.

The previous prime is 1217506673. The next prime is 1217506691. The reversal of 1217506680 is 866057121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 236130 + ... + 241230.

Almost surely, 2^1217506680 is an apocalyptic number.

1217506680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217506680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314267200).

1217506680 is an abundant number, since it is smaller than the sum of its proper divisors (3411027720).

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

1217506680 is a wasteful number, since it uses less digits than its factorization.

1217506680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151 (or 5141 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1217506680 is about 34892.7883666525. The cubic root of 1217506680 is about 1067.8013138791.

The spelling of 1217506680 in words is "one billion, two hundred seventeen million, five hundred six thousand, six hundred eighty".