1215065888 has 48 divisors (see below), whose sum is σ = 2538708480. Its totient is φ = 570479616.

The previous prime is 1215065881. The next prime is 1215065897. The reversal of 1215065888 is 8885605121.

It is a super-2 number, since 2×1215065888² = 2952770224362457088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1215065881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258245 + ... + 262907.

It is an arithmetic number, because the mean of its divisors is an integer number (52889760).

Almost surely, 2^1215065888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215065888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269354240).

1215065888 is an abundant number, since it is smaller than the sum of its proper divisors (1323642592).

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

1215065888 is a wasteful number, since it uses less digits than its factorization.

1215065888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5169 (or 5161 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 1215065888 is about 34857.7952257454. The cubic root of 1215065888 is about 1067.0872796063.

The spelling of 1215065888 in words is "one billion, two hundred fifteen million, sixty-five thousand, eight hundred eighty-eight".