64999983 has 8 divisors (see below), whose sum is σ = 87960448. Its totient is φ = 42686424.

The previous prime is 64999981. The next prime is 65000011. The reversal of 64999983 is 38999946.

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

It is not a de Polignac number, because 64999983 - 2¹ = 64999981 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 (64999981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161491 + ... + 161892.

It is an arithmetic number, because the mean of its divisors is an integer number (10995056).

Almost surely, 2^64999983 is an apocalyptic number.

64999983 is a deficient number, since it is larger than the sum of its proper divisors (22960465).

64999983 is a wasteful number, since it uses less digits than its factorization.

64999983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323453.

The product of its digits is 3779136, while the sum is 57.

The square root of 64999983 is about 8062.2566940032. The cubic root of 64999983 is about 402.0725408064.

The spelling of 64999983 in words is "sixty-four million, nine hundred ninety-nine thousand, nine hundred eighty-three".