187216705 has 32 divisors (see below), whose sum is σ = 248209920. Its totient is φ = 134722560.

The previous prime is 187216681. The next prime is 187216717. The reversal of 187216705 is 507612781.

It is not a de Polignac number, because 187216705 - 2⁷ = 187216577 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521316 + ... + 521674.

It is an arithmetic number, because the mean of its divisors is an integer number (7756560).

Almost surely, 2^187216705 is an apocalyptic number.

It is an amenable number.

187216705 is a deficient number, since it is larger than the sum of its proper divisors (60993215).

187216705 is a wasteful number, since it uses less digits than its factorization.

187216705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 187216705 is about 13682.7155564968. The cubic root of 187216705 is about 572.0687165803.

The spelling of 187216705 in words is "one hundred eighty-seven million, two hundred sixteen thousand, seven hundred five".