216435625 has 40 divisors (see below), whose sum is σ = 314549312. Its totient is φ = 145800000.

The previous prime is 216435617. The next prime is 216435643. The reversal of 216435625 is 526534612.

It is not a de Polignac number, because 216435625 - 2³ = 216435617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 266470 + ... + 267280.

Almost surely, 2^216435625 is an apocalyptic number.

216435625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216435625 is a deficient number, since it is larger than the sum of its proper divisors (98113687).

216435625 is an frugal number, since it uses more digits than its factorization.

216435625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 884 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 216435625 is about 14711.7512553741. The cubic root of 216435625 is about 600.4030856241.

The spelling of 216435625 in words is "two hundred sixteen million, four hundred thirty-five thousand, six hundred twenty-five".