1221776072 has 32 divisors (see below), whose sum is σ = 2501258400. Its totient is φ = 554870400.

The previous prime is 1221776053. The next prime is 1221776089. The reversal of 1221776072 is 2706771221.

It is a super-2 number, since 2×1221776072² = 2985473540223498368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108047 + ... + 118817.

It is an arithmetic number, because the mean of its divisors is an integer number (78164325).

Almost surely, 2^1221776072 is an apocalyptic number.

It is an amenable number.

1221776072 is an abundant number, since it is smaller than the sum of its proper divisors (1279482328).

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

1221776072 is a wasteful number, since it uses less digits than its factorization.

1221776072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12077 (or 12073 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 1221776072 is about 34953.9135434074. The cubic root of 1221776072 is about 1069.0479994245.

The spelling of 1221776072 in words is "one billion, two hundred twenty-one million, seven hundred seventy-six thousand, seventy-two".