1272219660 has 144 divisors (see below), whose sum is σ = 3962038080. Its totient is φ = 330324480.

The previous prime is 1272219659. The next prime is 1272219661. The reversal of 1272219660 is 669122721.

It is an interprime number because it is at equal distance from previous prime (1272219659) and next prime (1272219661).

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

It is not an unprimeable number, because it can be changed into a prime (1272219661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1196289 + ... + 1197351.

Almost surely, 2^1272219660 is an apocalyptic number.

1272219660 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 1272219660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1981019040).

1272219660 is an abundant number, since it is smaller than the sum of its proper divisors (2689818420).

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

1272219660 is a wasteful number, since it uses less digits than its factorization.

1272219660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1272219660 is about 35668.1883476018. The cubic root of 1272219660 is about 1083.5626688177.

The spelling of 1272219660 in words is "one billion, two hundred seventy-two million, two hundred nineteen thousand, six hundred sixty".