187345478220 has 24 divisors (see below), whose sum is σ = 524567339184. Its totient is φ = 49958794176.

The previous prime is 187345478219. The next prime is 187345478227. The reversal of 187345478220 is 22874543781.

It is a happy number.

187345478220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (187345478227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561212259 + ... + 1561212378.

It is an arithmetic number, because the mean of its divisors is an integer number (21856972466).

Almost surely, 2^187345478220 is an apocalyptic number.

187345478220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187345478220 is an abundant number, since it is smaller than the sum of its proper divisors (337221860964).

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

187345478220 is a wasteful number, since it uses less digits than its factorization.

187345478220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122424649 (or 3122424647 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 51.

The spelling of 187345478220 in words is "one hundred eighty-seven billion, three hundred forty-five million, four hundred seventy-eight thousand, two hundred twenty".