1220557264 has 40 divisors (see below), whose sum is σ = 2491894080. Its totient is φ = 577555200.

The previous prime is 1220557231. The next prime is 1220557267. The reversal of 1220557264 is 4627550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220557267) by changing a digit.

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, 448869 + ... + 451579.

It is an arithmetic number, because the mean of its divisors is an integer number (62297352).

Almost surely, 2^1220557264 is an apocalyptic number.

It is an amenable number.

1220557264 is an abundant number, since it is smaller than the sum of its proper divisors (1271336816).

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

1220557264 is a wasteful number, since it uses less digits than its factorization.

1220557264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219 (or 4213 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 1220557264 is about 34936.4746933631. The cubic root of 1220557264 is about 1068.6923975019.

The spelling of 1220557264 in words is "one billion, two hundred twenty million, five hundred fifty-seven thousand, two hundred sixty-four".