1215223680 has 256 divisors, whose sum is σ = 4263632640. Its totient is φ = 291962880.

The previous prime is 1215223651. The next prime is 1215223687. The reversal of 1215223680 is 863225121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215223687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3442384 + ... + 3442736.

It is an arithmetic number, because the mean of its divisors is an integer number (16654815).

Almost surely, 2^1215223680 is an apocalyptic number.

1215223680 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 1215223680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2131816320).

1215223680 is an abundant number, since it is smaller than the sum of its proper divisors (3048408960).

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

1215223680 is a wasteful number, since it uses less digits than its factorization.

1215223680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1215223680 is about 34860.0585197443. The cubic root of 1215223680 is about 1067.1334692957.

The spelling of 1215223680 in words is "one billion, two hundred fifteen million, two hundred twenty-three thousand, six hundred eighty".