647218467 has 24 divisors (see below), whose sum is σ = 1097304416. Its totient is φ = 359842176.

The previous prime is 647218447. The next prime is 647218471. The reversal of 647218467 is 764812746.

It is not a de Polignac number, because 647218467 - 2⁸ = 647218211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647218427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136498 + ... + 141159.

Almost surely, 2^647218467 is an apocalyptic number.

647218467 is a deficient number, since it is larger than the sum of its proper divisors (450085949).

647218467 is a wasteful number, since it uses less digits than its factorization.

647218467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277707 (or 277704 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 647218467 is about 25440.4887335130. The cubic root of 647218467 is about 865.0017116030.

The spelling of 647218467 in words is "six hundred forty-seven million, two hundred eighteen thousand, four hundred sixty-seven".