189678997720 has 16 divisors (see below), whose sum is σ = 426777744960. Its totient is φ = 75871599072.

The previous prime is 189678997699. The next prime is 189678997723. The reversal of 189678997720 is 27799876981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189678997723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2370987432 + ... + 2370987511.

It is an arithmetic number, because the mean of its divisors is an integer number (26673609060).

Almost surely, 2^189678997720 is an apocalyptic number.

189678997720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189678997720 is an abundant number, since it is smaller than the sum of its proper divisors (237098747240).

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

189678997720 is a wasteful number, since it uses less digits than its factorization.

189678997720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741974954 (or 4741974950 counting only the distinct ones).

The product of its (nonzero) digits is 192036096, while the sum is 73.

The spelling of 189678997720 in words is "one hundred eighty-nine billion, six hundred seventy-eight million, nine hundred ninety-seven thousand, seven hundred twenty".