64943855 has 8 divisors (see below), whose sum is σ = 78170064. Its totient is φ = 51796800.

The previous prime is 64943821. The next prime is 64943873. The reversal of 64943855 is 55834946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64943855 - 2¹⁰ = 64942831 is a prime.

It is a super-2 number, since 2×64943855² = 8435408604522050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17966 + ... + 21275.

It is an arithmetic number, because the mean of its divisors is an integer number (9771258).

Almost surely, 2^64943855 is an apocalyptic number.

64943855 is a deficient number, since it is larger than the sum of its proper divisors (13226209).

64943855 is a wasteful number, since it uses less digits than its factorization.

64943855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39577.

The product of its digits is 518400, while the sum is 44.

The square root of 64943855 is about 8058.7750309833. The cubic root of 64943855 is about 401.9567765380.

The spelling of 64943855 in words is "sixty-four million, nine hundred forty-three thousand, eight hundred fifty-five".