1220885312 has 28 divisors (see below), whose sum is σ = 2423806176. Its totient is φ = 610162560.

The previous prime is 1220885279. The next prime is 1220885317. The reversal of 1220885312 is 2135880221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220885317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259493 + ... + 264155.

Almost surely, 2^1220885312 is an apocalyptic number.

It is an amenable number.

1220885312 is a deficient number, since it is larger than the sum of its proper divisors (1202920864).

1220885312 is an equidigital number, since it uses as much as digits as its factorization.

1220885312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766 (or 8756 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1220885312 is about 34941.1692992664. The cubic root of 1220885312 is about 1068.7881327342.

The spelling of 1220885312 in words is "one billion, two hundred twenty million, eight hundred eighty-five thousand, three hundred twelve".