28930181780 has 54 divisors (see below), whose sum is σ = 61715475738. Its totient is φ = 11391644160.

The previous prime is 28930181767. The next prime is 28930181803. The reversal of 28930181780 is 8718103982.

It can be written as a sum of positive squares in 9 ways, for example, as 9659744656 + 19270437124 = 98284^2 + 138818^2 .

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 55527920 + ... + 55528440.

Almost surely, 2^28930181780 is an apocalyptic number.

28930181780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28930181780 is an abundant number, since it is smaller than the sum of its proper divisors (32785293958).

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

28930181780 is an frugal number, since it uses more digits than its factorization.

28930181780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 28930181780 in words is "twenty-eight billion, nine hundred thirty million, one hundred eighty-one thousand, seven hundred eighty".