1211275680 has 96 divisors (see below), whose sum is σ = 3981446784. Its totient is φ = 308960256.

The previous prime is 1211275651. The next prime is 1211275717. The reversal of 1211275680 is 865721121.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43819 + ... + 65898.

It is an arithmetic number, because the mean of its divisors is an integer number (41473404).

Almost surely, 2^1211275680 is an apocalyptic number.

1211275680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211275680 is an abundant number, since it is smaller than the sum of its proper divisors (2770171104).

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

1211275680 is a wasteful number, since it uses less digits than its factorization.

1211275680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109758 (or 109750 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 1211275680 is about 34803.3860421655. The cubic root of 1211275680 is about 1065.9765866351.

The spelling of 1211275680 in words is "one billion, two hundred eleven million, two hundred seventy-five thousand, six hundred eighty".