247668 has 12 divisors (see below), whose sum is σ = 577920. Its totient is φ = 82552.

The previous prime is 247651. The next prime is 247691. The reversal of 247668 is 866742.

247668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×247668² = 122678876448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10308 + ... + 10331.

It is an arithmetic number, because the mean of its divisors is an integer number (48160).

2²⁴⁷⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

247668 is an abundant number, since it is smaller than the sum of its proper divisors (330252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247668 is a wasteful number, since it uses less digits than its factorization.

247668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20646 (or 20644 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 247668 is about 497.6625362633. The cubic root of 247668 is about 62.7995645500.

Subtracting from 247668 its product of digits (16128), we obtain a triangular number (231540 = T₆₈₀).

The spelling of 247668 in words is "two hundred forty-seven thousand, six hundred sixty-eight".