1220617456 has 20 divisors (see below), whose sum is σ = 2489417800. Its totient is φ = 578187072.

The previous prime is 1220617439. The next prime is 1220617469. The reversal of 1220617456 is 6547160221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007291 + ... + 2007898.

It is an arithmetic number, because the mean of its divisors is an integer number (124470890).

Almost surely, 2^1220617456 is an apocalyptic number.

1220617456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1220617456 is an abundant number, since it is smaller than the sum of its proper divisors (1268800344).

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

1220617456 is a wasteful number, since it uses less digits than its factorization.

1220617456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015216 (or 4015210 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1220617456 is about 34937.3361319950. The cubic root of 1220617456 is about 1068.7099647988.

Adding to 1220617456 its reverse (6547160221), we get a palindrome (7767777677).

The spelling of 1220617456 in words is "one billion, two hundred twenty million, six hundred seventeen thousand, four hundred fifty-six".