216749925 has 84 divisors (see below), whose sum is σ = 460808800. Its totient is φ = 99027360.

The previous prime is 216749917. The next prime is 216749941. The reversal of 216749925 is 529947612.

It is not a de Polignac number, because 216749925 - 2³ = 216749917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 83 ways as a sum of consecutive naturals, for example, 126726 + ... + 128424.

Almost surely, 2^216749925 is an apocalyptic number.

216749925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216749925 is an abundant number, since it is smaller than the sum of its proper divisors (244058875).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216749925 is an equidigital number, since it uses as much as digits as its factorization.

216749925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1714 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 216749925 is about 14722.4293172017. The cubic root of 216749925 is about 600.6935729520.

The spelling of 216749925 in words is "two hundred sixteen million, seven hundred forty-nine thousand, nine hundred twenty-five".