64509479 has 4 divisors (see below), whose sum is σ = 65602920. Its totient is φ = 63416040.

The previous prime is 64509461. The next prime is 64509491. The reversal of 64509479 is 97490546.

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 64509479 - 2¹⁶ = 64443943 is a prime.

It is a super-2 number, since 2×64509479² = 8322945761702882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64509439) 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, 546632 + ... + 546749.

It is an arithmetic number, because the mean of its divisors is an integer number (16400730).

Almost surely, 2^64509479 is an apocalyptic number.

64509479 is a deficient number, since it is larger than the sum of its proper divisors (1093441).

64509479 is a wasteful number, since it uses less digits than its factorization.

64509479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093440.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 64509479 is about 8031.7793171874. The cubic root of 64509479 is about 401.0586104715.

The spelling of 64509479 in words is "sixty-four million, five hundred nine thousand, four hundred seventy-nine".