213793778 has 8 divisors (see below), whose sum is σ = 349844400. Its totient is φ = 97178980.

The previous prime is 213793759. The next prime is 213793817. The reversal of 213793778 is 877397312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4858928 + ... + 4858971.

It is an arithmetic number, because the mean of its divisors is an integer number (43730550).

Almost surely, 2^213793778 is an apocalyptic number.

213793778 is a deficient number, since it is larger than the sum of its proper divisors (136050622).

213793778 is a wasteful number, since it uses less digits than its factorization.

213793778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717912.

The product of its digits is 444528, while the sum is 47.

The square root of 213793778 is about 14621.6886165723. The cubic root of 213793778 is about 597.9502070747.

The spelling of 213793778 in words is "two hundred thirteen million, seven hundred ninety-three thousand, seven hundred seventy-eight".