1220600656 has 40 divisors (see below), whose sum is σ = 2611020384. Its totient is φ = 548127360.

The previous prime is 1220600609. The next prime is 1220600687. The reversal of 1220600656 is 6560060221.

It is a super-2 number, since 2×1220600656² = 2979731922855260672, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 27171 + ... + 56386.

Almost surely, 2^1220600656 is an apocalyptic number.

1220600656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1220600656 is an abundant number, since it is smaller than the sum of its proper divisors (1390419728).

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

1220600656 is a wasteful number, since it uses less digits than its factorization.

1220600656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83659 (or 83653 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1220600656 is about 34937.0957007019. The cubic root of 1220600656 is about 1068.7050617038.

Adding to 1220600656 its reverse (6560060221), we get a palindrome (7780660877).

The spelling of 1220600656 in words is "one billion, two hundred twenty million, six hundred thousand, six hundred fifty-six".