1768884221 has 16 divisors (see below), whose sum is σ = 2028197808. Its totient is φ = 1528243200.

The previous prime is 1768884209. The next prime is 1768884233. The reversal of 1768884221 is 1224888671.

It is an interprime number because it is at equal distance from previous prime (1768884209) and next prime (1768884233).

It can be written as a sum of positive squares in 8 ways, for example, as 3960100 + 1764924121 = 1990^2 + 42011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1768884221 - 2²² = 1764689917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1768884281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17891 + ... + 62111.

It is an arithmetic number, because the mean of its divisors is an integer number (126762363).

Almost surely, 2^1768884221 is an apocalyptic number.

It is an amenable number.

1768884221 is a deficient number, since it is larger than the sum of its proper divisors (259313587).

1768884221 is a wasteful number, since it uses less digits than its factorization.

1768884221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44432.

The product of its digits is 344064, while the sum is 47.

The square root of 1768884221 is about 42058.1052949369. The cubic root of 1768884221 is about 1209.3902674425.

The spelling of 1768884221 in words is "one billion, seven hundred sixty-eight million, eight hundred eighty-four thousand, two hundred twenty-one".