64021147 has 4 divisors (see below), whose sum is σ = 65070736. Its totient is φ = 62971560.

The previous prime is 64021129. The next prime is 64021187. The reversal of 64021147 is 74112046.

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 64021147 - 2¹¹ = 64019099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64021187) 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, 524703 + ... + 524824.

It is an arithmetic number, because the mean of its divisors is an integer number (16267684).

Almost surely, 2^64021147 is an apocalyptic number.

64021147 is a deficient number, since it is larger than the sum of its proper divisors (1049589).

64021147 is a wasteful number, since it uses less digits than its factorization.

64021147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049588.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 64021147 is about 8001.3215783394. The cubic root of 64021147 is about 400.0440513985.

The spelling of 64021147 in words is "sixty-four million, twenty-one thousand, one hundred forty-seven".