1215706720 has 48 divisors (see below), whose sum is σ = 3041061408. Its totient is φ = 457676800.

The previous prime is 1215706691. The next prime is 1215706763. The reversal of 1215706720 is 276075121.

It is a congruent number.

It is an unprimeable number.

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, 220756 + ... + 226195.

It is an arithmetic number, because the mean of its divisors is an integer number (63355446).

Almost surely, 2^1215706720 is an apocalyptic number.

1215706720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215706720 is an abundant number, since it is smaller than the sum of its proper divisors (1825354688).

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

1215706720 is a wasteful number, since it uses less digits than its factorization.

1215706720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446983 (or 446975 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 1215706720 is about 34866.9861043366. The cubic root of 1215706720 is about 1067.2748424098.

The spelling of 1215706720 in words is "one billion, two hundred fifteen million, seven hundred six thousand, seven hundred twenty".