67664047 has 16 divisors (see below), whose sum is σ = 77035680. Its totient is φ = 59357760.

The previous prime is 67664033. The next prime is 67664087. The reversal of 67664047 is 74046676.

It is a de Polignac number, because none of the positive numbers 2^k-67664047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67664087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37723 + ... + 39475.

It is an arithmetic number, because the mean of its divisors is an integer number (4814730).

Almost surely, 2^67664047 is an apocalyptic number.

67664047 is a deficient number, since it is larger than the sum of its proper divisors (9371633).

67664047 is a wasteful number, since it uses less digits than its factorization.

67664047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815 (or 1793 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 67664047 is about 8225.8158865854. The cubic root of 67664047 is about 407.4922216137.

The spelling of 67664047 in words is "sixty-seven million, six hundred sixty-four thousand, forty-seven".