247216664 has 16 divisors (see below), whose sum is σ = 464704800. Its totient is φ = 123295392.

The previous prime is 247216639. The next prime is 247216681. The reversal of 247216664 is 466612742.

247216664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×247216664² = 122232157918577792, which contains 22 as substring.

It is a congruent number.

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, 35744 + ... + 42095.

It is an arithmetic number, because the mean of its divisors is an integer number (29044050).

Almost surely, 2^247216664 is an apocalyptic number.

It is an amenable number.

247216664 is a deficient number, since it is larger than the sum of its proper divisors (217488136).

247216664 is a wasteful number, since it uses less digits than its factorization.

247216664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78242 (or 78238 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

The square root of 247216664 is about 15723.1251346544. The cubic root of 247216664 is about 627.6139390885.

The spelling of 247216664 in words is "two hundred forty-seven million, two hundred sixteen thousand, six hundred sixty-four".