1219135680 has 504 divisors, whose sum is σ = 5000469552. Its totient is φ = 271724544.

The previous prime is 1219135661. The next prime is 1219135693. The reversal of 1219135680 is 865319121.

1219135680 is a `hidden beast` number, since 1 + 2 + 1 + 91 + 3 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7479279 + ... + 7479441.

Almost surely, 2^1219135680 is an apocalyptic number.

1219135680 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 1219135680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500234776).

1219135680 is an abundant number, since it is smaller than the sum of its proper divisors (3781333872).

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

1219135680 is a wasteful number, since it uses less digits than its factorization.

1219135680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1219135680 is about 34916.1234961729. The cubic root of 1219135680 is about 1068.2773340282.

The spelling of 1219135680 in words is "one billion, two hundred nineteen million, one hundred thirty-five thousand, six hundred eighty".