64473691 has 4 divisors (see below), whose sum is σ = 64506672. Its totient is φ = 64440712.

The previous prime is 64473683. The next prime is 64473697. The reversal of 64473691 is 19637446.

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 64473691 - 2³ = 64473683 is a prime.

It is a super-3 number, since 3×64473691³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 64473691 parts by 11355 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64473697) 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, 13360 + ... + 17533.

It is an arithmetic number, because the mean of its divisors is an integer number (16126668).

Almost surely, 2^64473691 is an apocalyptic number.

64473691 is a deficient number, since it is larger than the sum of its proper divisors (32981).

64473691 is a wasteful number, since it uses less digits than its factorization.

64473691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32980.

The product of its digits is 108864, while the sum is 40.

The square root of 64473691 is about 8029.5511082501. The cubic root of 64473691 is about 400.9844314990.

The spelling of 64473691 in words is "sixty-four million, four hundred seventy-three thousand, six hundred ninety-one".