1220523256 has 8 divisors (see below), whose sum is σ = 2288481120. Its totient is φ = 610261624.

The previous prime is 1220523251. The next prime is 1220523257. The reversal of 1220523256 is 6523250221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220523251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76282696 + ... + 76282711.

It is an arithmetic number, because the mean of its divisors is an integer number (286060140).

Almost surely, 2^1220523256 is an apocalyptic number.

It is an amenable number.

1220523256 is a deficient number, since it is larger than the sum of its proper divisors (1067957864).

1220523256 is a wasteful number, since it uses less digits than its factorization.

1220523256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152565413 (or 152565409 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1220523256 is about 34935.9879780149. The cubic root of 1220523256 is about 1068.6824718639.

Adding to 1220523256 its reverse (6523250221), we get a palindrome (7743773477).

The spelling of 1220523256 in words is "one billion, two hundred twenty million, five hundred twenty-three thousand, two hundred fifty-six".