1224643256 has 8 divisors (see below), whose sum is σ = 2296206120. Its totient is φ = 612321624.

The previous prime is 1224643249. The next prime is 1224643261. The reversal of 1224643256 is 6523464221.

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

It is a super-2 number, since 2×1224643256² = 2999502208932563072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76540196 + ... + 76540211.

It is an arithmetic number, because the mean of its divisors is an integer number (287025765).

Almost surely, 2^1224643256 is an apocalyptic number.

It is an amenable number.

1224643256 is a deficient number, since it is larger than the sum of its proper divisors (1071562864).

1224643256 is a wasteful number, since it uses less digits than its factorization.

1224643256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153080413 (or 153080409 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 1224643256 is about 34994.9032860501. The cubic root of 1224643256 is about 1069.8836033749.

The spelling of 1224643256 in words is "one billion, two hundred twenty-four million, six hundred forty-three thousand, two hundred fifty-six".