216749748 has 12 divisors (see below), whose sum is σ = 505749440. Its totient is φ = 72249912.

The previous prime is 216749717. The next prime is 216749749. The reversal of 216749748 is 847947612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 216749697 and 216749706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216749749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9031228 + ... + 9031251.

Almost surely, 2^216749748 is an apocalyptic number.

It is an amenable number.

216749748 is an abundant number, since it is smaller than the sum of its proper divisors (288999692).

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

216749748 is a wasteful number, since it uses less digits than its factorization.

216749748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18062486 (or 18062484 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 216749748 is about 14722.4233059643. The cubic root of 216749748 is about 600.6934094413.

It can be divided in two parts, 2167 and 49748, that added together give a palindrome (51915).

The spelling of 216749748 in words is "two hundred sixteen million, seven hundred forty-nine thousand, seven hundred forty-eight".