216457725 has 48 divisors (see below), whose sum is σ = 397117440. Its totient is φ = 103147200.

The previous prime is 216457691. The next prime is 216457729. The reversal of 216457725 is 527754612.

It is not a de Polignac number, because 216457725 - 2¹⁰ = 216456701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216457729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46452 + ... + 50898.

It is an arithmetic number, because the mean of its divisors is an integer number (8273280).

Almost surely, 2^216457725 is an apocalyptic number.

216457725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216457725 is a deficient number, since it is larger than the sum of its proper divisors (180659715).

216457725 is a wasteful number, since it uses less digits than its factorization.

216457725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530 (or 4525 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 216457725 is about 14712.5023364484. The cubic root of 216457725 is about 600.4235204249.

The spelling of 216457725 in words is "two hundred sixteen million, four hundred fifty-seven thousand, seven hundred twenty-five".