64971047 has 4 divisors (see below), whose sum is σ = 65015016. Its totient is φ = 64927080.

The previous prime is 64971043. The next prime is 64971073. The reversal of 64971047 is 74017946.

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 64971047 - 2² = 64971043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64971047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64971043) 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, 19688 + ... + 22749.

It is an arithmetic number, because the mean of its divisors is an integer number (16253754).

Almost surely, 2^64971047 is an apocalyptic number.

64971047 is a deficient number, since it is larger than the sum of its proper divisors (43969).

64971047 is a wasteful number, since it uses less digits than its factorization.

64971047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43968.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 64971047 is about 8060.4619594661. The cubic root of 64971047 is about 402.0128684939.

The spelling of 64971047 in words is "sixty-four million, nine hundred seventy-one thousand, forty-seven".