1215660520 has 32 divisors (see below), whose sum is σ = 2752031520. Its totient is φ = 483278400.

The previous prime is 1215660473. The next prime is 1215660533. The reversal of 1215660520 is 250665121.

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, 86706 + ... + 99745.

It is an arithmetic number, because the mean of its divisors is an integer number (86000985).

Almost surely, 2^1215660520 is an apocalyptic number.

1215660520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215660520 is an abundant number, since it is smaller than the sum of its proper divisors (1536371000).

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

1215660520 is a wasteful number, since it uses less digits than its factorization.

1215660520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186625 (or 186621 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1215660520 is about 34866.3235802113. The cubic root of 1215660520 is about 1067.2613225037.

The spelling of 1215660520 in words is "one billion, two hundred fifteen million, six hundred sixty thousand, five hundred twenty".