64169947 has 4 divisors (see below), whose sum is σ = 64316560. Its totient is φ = 64023336.

The previous prime is 64169939. The next prime is 64169981. The reversal of 64169947 is 74996146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64169947 - 2³ = 64169939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64169897 and 64169906.

It is not an unprimeable number, because it can be changed into a prime (64169047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72648 + ... + 73525.

It is an arithmetic number, because the mean of its divisors is an integer number (16079140).

Almost surely, 2^64169947 is an apocalyptic number.

64169947 is a deficient number, since it is larger than the sum of its proper divisors (146613).

64169947 is a wasteful number, since it uses less digits than its factorization.

64169947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146612.

The product of its digits is 326592, while the sum is 46.

The square root of 64169947 is about 8010.6146455812. The cubic root of 64169947 is about 400.3537433219.

The spelling of 64169947 in words is "sixty-four million, one hundred sixty-nine thousand, nine hundred forty-seven".