187664994 has 24 divisors (see below), whose sum is σ = 443572272. Its totient is φ = 56868120.

The previous prime is 187664993. The next prime is 187665019. The reversal of 187664994 is 499466781.

187664994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 187664994.

It is not an unprimeable number, because it can be changed into a prime (187664993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473704 + ... + 474099.

It is an arithmetic number, because the mean of its divisors is an integer number (18482178).

Almost surely, 2^187664994 is an apocalyptic number.

187664994 is an abundant number, since it is smaller than the sum of its proper divisors (255907278).

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

187664994 is a wasteful number, since it uses less digits than its factorization.

187664994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947822 (or 947819 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 187664994 is about 13699.0873418633. The cubic root of 187664994 is about 572.5249573733.

The spelling of 187664994 in words is "one hundred eighty-seven million, six hundred sixty-four thousand, nine hundred ninety-four".