216863740 has 24 divisors (see below), whose sum is σ = 471119040. Its totient is φ = 83754048.

The previous prime is 216863737. The next prime is 216863741. The reversal of 216863740 is 47368612.

It is a self number, because there is not a number n which added to its sum of digits gives 216863740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216863741) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 186372 + ... + 187531.

It is an arithmetic number, because the mean of its divisors is an integer number (19629960).

Almost surely, 2^216863740 is an apocalyptic number.

216863740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216863740 is an abundant number, since it is smaller than the sum of its proper divisors (254255300).

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

216863740 is a wasteful number, since it uses less digits than its factorization.

216863740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373941 (or 373939 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 216863740 is about 14726.2941706323. The cubic root of 216863740 is about 600.7986955964.

The spelling of 216863740 in words is "two hundred sixteen million, eight hundred sixty-three thousand, seven hundred forty".