64487947 has 4 divisors (see below), whose sum is σ = 64844416. Its totient is φ = 64131480.

The previous prime is 64487923. The next prime is 64487959. The reversal of 64487947 is 74978446.

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-64487947 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 64487947.

It is not an unprimeable number, because it can be changed into a prime (64487047) 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, 177963 + ... + 178324.

It is an arithmetic number, because the mean of its divisors is an integer number (16211104).

Almost surely, 2^64487947 is an apocalyptic number.

64487947 is a deficient number, since it is larger than the sum of its proper divisors (356469).

64487947 is a wasteful number, since it uses less digits than its factorization.

64487947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356468.

The product of its digits is 1354752, while the sum is 49.

The square root of 64487947 is about 8030.4387800418. The cubic root of 64487947 is about 401.0139836708.

The spelling of 64487947 in words is "sixty-four million, four hundred eighty-seven thousand, nine hundred forty-seven".