18400530780 has 48 divisors (see below), whose sum is σ = 57246097440. Its totient is φ = 4906808064.

The previous prime is 18400530751. The next prime is 18400530787. The reversal of 18400530780 is 8703500481.

18400530780 is a `hidden beast` number, since 1 + 8 + 40 + 0 + 530 + 7 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400530787) 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, 17036989 + ... + 17038068.

It is an arithmetic number, because the mean of its divisors is an integer number (1192627030).

Almost surely, 2^18400530780 is an apocalyptic number.

18400530780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18400530780 is an abundant number, since it is smaller than the sum of its proper divisors (38845566660).

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

18400530780 is a wasteful number, since it uses less digits than its factorization.

18400530780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34075075 (or 34075067 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 18400530780 in words is "eighteen billion, four hundred million, five hundred thirty thousand, seven hundred eighty".