1780331868 has 72 divisors (see below), whose sum is σ = 5445734112. Its totient is φ = 478743552.

The previous prime is 1780331857. The next prime is 1780331869. The reversal of 1780331868 is 8681330871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780331869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203505 + ... + 212072.

It is an arithmetic number, because the mean of its divisors is an integer number (75635196).

Almost surely, 2^1780331868 is an apocalyptic number.

1780331868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1780331868 is an abundant number, since it is smaller than the sum of its proper divisors (3665402244).

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

1780331868 is a wasteful number, since it uses less digits than its factorization.

1780331868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415611 (or 415606 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1780331868 is about 42193.9790491487. The cubic root of 1780331868 is about 1211.9935871961.

The spelling of 1780331868 in words is "one billion, seven hundred eighty million, three hundred thirty-one thousand, eight hundred sixty-eight".