1215280000 has 160 divisors (see below), whose sum is σ = 3302786520. Its totient is φ = 441600000.

The previous prime is 1215279997. The next prime is 1215280007. The reversal of 1215280000 is 825121.

It is a tau number, because it is divible by the number of its divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 1215280000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215280007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 879310 + ... + 880690.

Almost surely, 2^1215280000 is an apocalyptic number.

1215280000 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 1215280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651393260).

1215280000 is an abundant number, since it is smaller than the sum of its proper divisors (2087506520).

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

1215280000 is an equidigital number, since it uses as much as digits as its factorization.

1215280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1215280000 is about 34860.8663116682. The cubic root of 1215280000 is about 1067.1499546088.

The spelling of 1215280000 in words is "one billion, two hundred fifteen million, two hundred eighty thousand".