187785288964 has 81 divisors (see below), whose sum is σ = 414119055231. Its totient is φ = 74257485120.

The previous prime is 187785288961. The next prime is 187785288979. The reversal of 187785288964 is 469882587781.

The square root of 187785288964 is 433342.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 156032900100 + 31752388864 = 395010^2 + 178192^2 .

It is not an unprimeable number, because it can be changed into a prime (187785288961) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 78867054 + ... + 78869434.

Almost surely, 2^187785288964 is an apocalyptic number.

187785288964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

187785288964 is the 433342-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 187785288964

187785288964 is an abundant number, since it is smaller than the sum of its proper divisors (226333766267).

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

187785288964 is an equidigital number, since it uses as much as digits as its factorization.

187785288964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 2403 counting only the distinct ones).

The product of its digits is 433520640, while the sum is 73.

The spelling of 187785288964 in words is "one hundred eighty-seven billion, seven hundred eighty-five million, two hundred eighty-eight thousand, nine hundred sixty-four".