216881715 has 8 divisors (see below), whose sum is σ = 347010768. Its totient is φ = 115670240.

The previous prime is 216881683. The next prime is 216881729. The reversal of 216881715 is 517188612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216881715 - 2⁵ = 216881683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7229376 + ... + 7229405.

It is an arithmetic number, because the mean of its divisors is an integer number (43376346).

Almost surely, 2^216881715 is an apocalyptic number.

216881715 is a deficient number, since it is larger than the sum of its proper divisors (130129053).

216881715 is a wasteful number, since it uses less digits than its factorization.

216881715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14458789.

The product of its digits is 26880, while the sum is 39.

The square root of 216881715 is about 14726.9044608838. The cubic root of 216881715 is about 600.8152944343.

The spelling of 216881715 in words is "two hundred sixteen million, eight hundred eighty-one thousand, seven hundred fifteen".