216572825 has 24 divisors (see below), whose sum is σ = 308069568. Its totient is φ = 147948480.

The previous prime is 216572821. The next prime is 216572831. The reversal of 216572825 is 528275612.

216572825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216572825 - 2² = 216572821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216572821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47339 + ... + 51711.

It is an arithmetic number, because the mean of its divisors is an integer number (12836232).

Almost surely, 2^216572825 is an apocalyptic number.

216572825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216572825 is a deficient number, since it is larger than the sum of its proper divisors (91496743).

216572825 is a wasteful number, since it uses less digits than its factorization.

216572825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4673 (or 4668 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 216572825 is about 14716.4134557303. The cubic root of 216572825 is about 600.5299253459.

The spelling of 216572825 in words is "two hundred sixteen million, five hundred seventy-two thousand, eight hundred twenty-five".