216986725 has 24 divisors (see below), whose sum is σ = 285785280. Its totient is φ = 162865920.

The previous prime is 216986711. The next prime is 216986743. The reversal of 216986725 is 527689612.

It is not a de Polignac number, because 216986725 - 2¹³ = 216978533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185994 + ... + 187156.

It is an arithmetic number, because the mean of its divisors is an integer number (11907720).

Almost surely, 2^216986725 is an apocalyptic number.

216986725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216986725 is a deficient number, since it is larger than the sum of its proper divisors (68798555).

216986725 is a wasteful number, since it uses less digits than its factorization.

216986725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1624 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 216986725 is about 14730.4692729051. The cubic root of 216986725 is about 600.9122465667.

The spelling of 216986725 in words is "two hundred sixteen million, nine hundred eighty-six thousand, seven hundred twenty-five".