64842971 has 4 divisors (see below), whose sum is σ = 64860000. Its totient is φ = 64825944.

The previous prime is 64842961. The next prime is 64842989. The reversal of 64842971 is 17924846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64842971 is a prime.

It is a super-2 number, since 2×64842971² = 8409221776213682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64842961) 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, 110 + ... + 11388.

It is an arithmetic number, because the mean of its divisors is an integer number (16215000).

Almost surely, 2^64842971 is an apocalyptic number.

64842971 is a deficient number, since it is larger than the sum of its proper divisors (17029).

64842971 is a wasteful number, since it uses less digits than its factorization.

64842971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17028.

The product of its digits is 96768, while the sum is 41.

The square root of 64842971 is about 8052.5133343572. The cubic root of 64842971 is about 401.7485350093.

The spelling of 64842971 in words is "sixty-four million, eight hundred forty-two thousand, nine hundred seventy-one".