64748509 has 4 divisors (see below), whose sum is σ = 73998304. Its totient is φ = 55498716.

The previous prime is 64748501. The next prime is 64748531. The reversal of 64748509 is 90584746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64748509 - 2³ = 64748501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64748501) 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, 4624887 + ... + 4624900.

It is an arithmetic number, because the mean of its divisors is an integer number (18499576).

Almost surely, 2^64748509 is an apocalyptic number.

It is an amenable number.

64748509 is a deficient number, since it is larger than the sum of its proper divisors (9249795).

64748509 is an equidigital number, since it uses as much as digits as its factorization.

64748509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9249794.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 64748509 is about 8046.6458229501. The cubic root of 64748509 is about 401.5533536724.

The spelling of 64748509 in words is "sixty-four million, seven hundred forty-eight thousand, five hundred nine".