64843994 has 4 divisors (see below), whose sum is σ = 97265994. Its totient is φ = 32421996.

The previous prime is 64843993. The next prime is 64843997. The reversal of 64843994 is 49934846.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 32638369 + 32205625 = 5713^2 + 5675^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64843993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16210997 + ... + 16211000.

Almost surely, 2^64843994 is an apocalyptic number.

64843994 is a deficient number, since it is larger than the sum of its proper divisors (32422000).

64843994 is a wasteful number, since it uses less digits than its factorization.

64843994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32421999.

The product of its digits is 746496, while the sum is 47.

The square root of 64843994 is about 8052.5768546472. The cubic root of 64843994 is about 401.7506477368.

The spelling of 64843994 in words is "sixty-four million, eight hundred forty-three thousand, nine hundred ninety-four".