1220890755 has 32 divisors (see below), whose sum is σ = 2243856384. Its totient is φ = 555278976.

The previous prime is 1220890747. The next prime is 1220890799. The reversal of 1220890755 is 5570980221.

It is not a de Polignac number, because 1220890755 - 2³ = 1220890747 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 8827 + ... + 50196.

It is an arithmetic number, because the mean of its divisors is an integer number (70120512).

Almost surely, 2^1220890755 is an apocalyptic number.

1220890755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220890755 is a deficient number, since it is larger than the sum of its proper divisors (1022965629).

1220890755 is a wasteful number, since it uses less digits than its factorization.

1220890755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59235.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 1220890755 is about 34941.2471872428. The cubic root of 1220890755 is about 1068.7897210366.

The spelling of 1220890755 in words is "one billion, two hundred twenty million, eight hundred ninety thousand, seven hundred fifty-five".