64428643 has 8 divisors (see below), whose sum is σ = 65088000. Its totient is φ = 63772608.

The previous prime is 64428641. The next prime is 64428647. The reversal of 64428643 is 34682446.

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

It is a cyclic number.

It is not a de Polignac number, because 64428643 - 2¹ = 64428641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64428641) 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, 56503 + ... + 57631.

It is an arithmetic number, because the mean of its divisors is an integer number (8136000).

Almost surely, 2^64428643 is an apocalyptic number.

64428643 is a deficient number, since it is larger than the sum of its proper divisors (659357).

64428643 is a wasteful number, since it uses less digits than its factorization.

64428643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661.

The product of its digits is 110592, while the sum is 37.

The square root of 64428643 is about 8026.7454799564. The cubic root of 64428643 is about 400.8910199847.

The spelling of 64428643 in words is "sixty-four million, four hundred twenty-eight thousand, six hundred forty-three".