64988447 has 4 divisors (see below), whose sum is σ = 65563680. Its totient is φ = 64413216.

The previous prime is 64988393. The next prime is 64988471. The reversal of 64988447 is 74488946.

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 64988447 - 2⁶ = 64988383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64988395 and 64988404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64988047) 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, 287447 + ... + 287672.

It is an arithmetic number, because the mean of its divisors is an integer number (16390920).

Almost surely, 2^64988447 is an apocalyptic number.

64988447 is a deficient number, since it is larger than the sum of its proper divisors (575233).

64988447 is a wasteful number, since it uses less digits than its factorization.

64988447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575232.

The product of its digits is 1548288, while the sum is 50.

The square root of 64988447 is about 8061.5412298146. The cubic root of 64988447 is about 402.0487531938.

The spelling of 64988447 in words is "sixty-four million, nine hundred eighty-eight thousand, four hundred forty-seven".