188423793640 has 32 divisors (see below), whose sum is σ = 425565550080. Its totient is φ = 75082937152.

The previous prime is 188423793637. The next prime is 188423793641. The reversal of 188423793640 is 46397324881.

It is not an unprimeable number, because it can be changed into a prime (188423793641) 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, 8944984 + ... + 8966023.

It is an arithmetic number, because the mean of its divisors is an integer number (13298923440).

Almost surely, 2^188423793640 is an apocalyptic number.

188423793640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188423793640 is an abundant number, since it is smaller than the sum of its proper divisors (237141756440).

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

188423793640 is a wasteful number, since it uses less digits than its factorization.

188423793640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17911281 (or 17911277 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 188423793640 in words is "one hundred eighty-eight billion, four hundred twenty-three million, seven hundred ninety-three thousand, six hundred forty".