64724871 has 4 divisors (see below), whose sum is σ = 86299832. Its totient is φ = 43149912.

The previous prime is 64724867. The next prime is 64724879. The reversal of 64724871 is 17842746.

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

It is not a de Polignac number, because 64724871 - 2² = 64724867 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 (64724879) 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, 10787476 + ... + 10787481.

It is an arithmetic number, because the mean of its divisors is an integer number (21574958).

Almost surely, 2^64724871 is an apocalyptic number.

64724871 is a deficient number, since it is larger than the sum of its proper divisors (21574961).

64724871 is a wasteful number, since it uses less digits than its factorization.

64724871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21574960.

The product of its digits is 75264, while the sum is 39.

The square root of 64724871 is about 8045.1768781053. The cubic root of 64724871 is about 401.5044821558.

The spelling of 64724871 in words is "sixty-four million, seven hundred twenty-four thousand, eight hundred seventy-one".