64443996 has 18 divisors (see below), whose sum is σ = 162900192. Its totient is φ = 21481320.

The previous prime is 64443983. The next prime is 64443997. The reversal of 64443996 is 69934446.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64443997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 895020 + ... + 895091.

Almost surely, 2^64443996 is an apocalyptic number.

It is an amenable number.

64443996 is an abundant number, since it is smaller than the sum of its proper divisors (98456196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64443996 is a wasteful number, since it uses less digits than its factorization.

64443996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790121 (or 1790116 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 64443996 is about 8027.7017881832. The cubic root of 64443996 is about 400.9228608489.

It can be divided in two parts, 6444 and 3996, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 64443996 in words is "sixty-four million, four hundred forty-three thousand, nine hundred ninety-six".