1780520868 has 36 divisors (see below), whose sum is σ = 5143727680. Its totient is φ = 508720176.

The previous prime is 1780520851. The next prime is 1780520927. The reversal of 1780520868 is 8680250871.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1780520868² = 6340509122766946848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3532528 + ... + 3533031.

Almost surely, 2^1780520868 is an apocalyptic number.

1780520868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1780520868 is an abundant number, since it is smaller than the sum of its proper divisors (3363206812).

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

1780520868 is a wasteful number, since it uses less digits than its factorization.

1780520868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065576 (or 7065571 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 1780520868 is about 42196.2186457507. The cubic root of 1780520868 is about 1212.0364740845.

The spelling of 1780520868 in words is "one billion, seven hundred eighty million, five hundred twenty thousand, eight hundred sixty-eight".