216780494 has 16 divisors (see below), whose sum is σ = 378636768. Its totient is φ = 91152672.

The previous prime is 216780493. The next prime is 216780511. The reversal of 216780494 is 494087612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216780493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145337 + ... + 146820.

It is an arithmetic number, because the mean of its divisors is an integer number (23664798).

Almost surely, 2^216780494 is an apocalyptic number.

216780494 is a deficient number, since it is larger than the sum of its proper divisors (161856274).

216780494 is a wasteful number, since it uses less digits than its factorization.

216780494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292219.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 216780494 is about 14723.4674584488. The cubic root of 216780494 is about 600.7218109297.

The spelling of 216780494 in words is "two hundred sixteen million, seven hundred eighty thousand, four hundred ninety-four".