1216270520 has 32 divisors (see below), whose sum is σ = 2774103120. Its totient is φ = 479842560.

The previous prime is 1216270499. The next prime is 1216270537. The reversal of 1216270520 is 250726121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216270520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205346 + ... + 211185.

Almost surely, 2^1216270520 is an apocalyptic number.

1216270520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216270520 is an abundant number, since it is smaller than the sum of its proper divisors (1557832600).

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

1216270520 is a wasteful number, since it uses less digits than its factorization.

1216270520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416615 (or 416611 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1216270520 is about 34875.0701791409. The cubic root of 1216270520 is about 1067.4398044987.

Adding to 1216270520 its reverse (250726121), we get a palindrome (1466996641).

The spelling of 1216270520 in words is "one billion, two hundred sixteen million, two hundred seventy thousand, five hundred twenty".