217880396 has 12 divisors (see below), whose sum is σ = 390590760. Its totient is φ = 106283040.

The previous prime is 217880371. The next prime is 217880407. The reversal of 217880396 is 693088712.

It is a super-2 number, since 2×217880396² = 94943733922233632, which contains 22 as substring.

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, 664106 + ... + 664433.

It is an arithmetic number, because the mean of its divisors is an integer number (32549230).

Almost surely, 2^217880396 is an apocalyptic number.

It is an amenable number.

217880396 is a deficient number, since it is larger than the sum of its proper divisors (172710364).

217880396 is a wasteful number, since it uses less digits than its factorization.

217880396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328584 (or 1328582 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 217880396 is about 14760.7722020225. The cubic root of 217880396 is about 601.7360792771.

The spelling of 217880396 in words is "two hundred seventeen million, eight hundred eighty thousand, three hundred ninety-six".