64428443 has 4 divisors (see below), whose sum is σ = 65644128. Its totient is φ = 63212760.

The previous prime is 64428409. The next prime is 64428499. The reversal of 64428443 is 34482446.

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

It is a cyclic number.

It is not a de Polignac number, because 64428443 - 2⁸ = 64428187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64428043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607763 + ... + 607868.

It is an arithmetic number, because the mean of its divisors is an integer number (16411032).

Almost surely, 2^64428443 is an apocalyptic number.

64428443 is a deficient number, since it is larger than the sum of its proper divisors (1215685).

64428443 is a wasteful number, since it uses less digits than its factorization.

64428443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215684.

The product of its digits is 73728, while the sum is 35.

The square root of 64428443 is about 8026.7330215973. The cubic root of 64428443 is about 400.8906051677.

The spelling of 64428443 in words is "sixty-four million, four hundred twenty-eight thousand, four hundred forty-three".