64784971 has 4 divisors (see below), whose sum is σ = 65257992. Its totient is φ = 64311952.

The previous prime is 64784959. The next prime is 64785001. The reversal of 64784971 is 17948746.

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 64784971 - 2⁵ = 64784939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64784171) 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, 236305 + ... + 236578.

It is an arithmetic number, because the mean of its divisors is an integer number (16314498).

Almost surely, 2^64784971 is an apocalyptic number.

64784971 is a deficient number, since it is larger than the sum of its proper divisors (473021).

64784971 is a wasteful number, since it uses less digits than its factorization.

64784971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473020.

The product of its digits is 338688, while the sum is 46.

The square root of 64784971 is about 8048.9111685991. The cubic root of 64784971 is about 401.6287154638.

It can be divided in two parts, 6478 and 4971, that added together give a square (11449 = 107²).

The spelling of 64784971 in words is "sixty-four million, seven hundred eighty-four thousand, nine hundred seventy-one".