213868978 has 8 divisors (see below), whose sum is σ = 337687920. Its totient is φ = 101306340.

The previous prime is 213868961. The next prime is 213868981. The reversal of 213868978 is 879868312.

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, 2814028 + ... + 2814103.

It is an arithmetic number, because the mean of its divisors is an integer number (42210990).

Almost surely, 2^213868978 is an apocalyptic number.

213868978 is a deficient number, since it is larger than the sum of its proper divisors (123818942).

213868978 is a wasteful number, since it uses less digits than its factorization.

213868978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628152.

The product of its digits is 1161216, while the sum is 52.

The square root of 213868978 is about 14624.2599128982. The cubic root of 213868978 is about 598.0203066895.

The spelling of 213868978 in words is "two hundred thirteen million, eight hundred sixty-eight thousand, nine hundred seventy-eight".