1768868990 has 64 divisors (see below), whose sum is σ = 3857891328. Its totient is φ = 571017600.

The previous prime is 1768868987. The next prime is 1768868999. The reversal of 1768868990 is 998688671.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1768868999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69275 + ... + 91305.

It is an arithmetic number, because the mean of its divisors is an integer number (60279552).

Almost surely, 2^1768868990 is an apocalyptic number.

1768868990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1768868990 is an abundant number, since it is smaller than the sum of its proper divisors (2089022338).

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

1768868990 is a wasteful number, since it uses less digits than its factorization.

1768868990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22113.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 1768868990 is about 42057.9242236228. The cubic root of 1768868990 is about 1209.3867962758.

The spelling of 1768868990 in words is "one billion, seven hundred sixty-eight million, eight hundred sixty-eight thousand, nine hundred ninety".