64842791 has 4 divisors (see below), whose sum is σ = 69830712. Its totient is φ = 59854872.

The previous prime is 64842787. The next prime is 64842857. The reversal of 64842791 is 19724846.

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 64842791 - 2² = 64842787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64842721) 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, 2493941 + ... + 2493966.

It is an arithmetic number, because the mean of its divisors is an integer number (17457678).

Almost surely, 2^64842791 is an apocalyptic number.

64842791 is a deficient number, since it is larger than the sum of its proper divisors (4987921).

64842791 is a wasteful number, since it uses less digits than its factorization.

64842791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987920.

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

The square root of 64842791 is about 8052.5021577147. The cubic root of 64842791 is about 401.7481632661.

The spelling of 64842791 in words is "sixty-four million, eight hundred forty-two thousand, seven hundred ninety-one".