1220747456 has 28 divisors (see below), whose sum is σ = 2424757152. Its totient is φ = 609785088.

The previous prime is 1220747417. The next prime is 1220747461. The reversal of 1220747456 is 6547470221.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61946 + ... + 79238.

Almost surely, 2^1220747456 is an apocalyptic number.

1220747456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1220747456 is a deficient number, since it is larger than the sum of its proper divisors (1204009696).

1220747456 is a wasteful number, since it uses less digits than its factorization.

1220747456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408 (or 18398 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 1220747456 is about 34939.1965563034. The cubic root of 1220747456 is about 1068.7479038934.

The spelling of 1220747456 in words is "one billion, two hundred twenty million, seven hundred forty-seven thousand, four hundred fifty-six".