64643073 has 16 divisors (see below), whose sum is σ = 98976000. Its totient is φ = 37115280.

The previous prime is 64643069. The next prime is 64643081. The reversal of 64643073 is 37034646.

It is not a de Polignac number, because 64643073 - 2² = 64643069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (64643083) 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, 50923 + ... + 52176.

It is an arithmetic number, because the mean of its divisors is an integer number (6186000).

It is a Proth number, since it is equal to 7891 ⋅ 2¹³ + 1 and 7891 < 2¹³.

Almost surely, 2^64643073 is an apocalyptic number.

It is an amenable number.

64643073 is a deficient number, since it is larger than the sum of its proper divisors (34332927).

64643073 is a wasteful number, since it uses less digits than its factorization.

64643073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103132.

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 64643073 is about 8040.0916039558. The cubic root of 64643073 is about 401.3352730714.

The spelling of 64643073 in words is "sixty-four million, six hundred forty-three thousand, seventy-three".