64388761 has 4 divisors (see below), whose sum is σ = 64413952. Its totient is φ = 64363572.

The previous prime is 64388747. The next prime is 64388783. The reversal of 64388761 is 16788346.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16788346 = 2 ⋅8394173.

It is a cyclic number.

It is not a de Polignac number, because 64388761 - 2⁷ = 64388633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64388791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8265 + ... + 14038.

It is an arithmetic number, because the mean of its divisors is an integer number (16103488).

Almost surely, 2^64388761 is an apocalyptic number.

It is an amenable number.

64388761 is a deficient number, since it is larger than the sum of its proper divisors (25191).

64388761 is a wasteful number, since it uses less digits than its factorization.

64388761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25190.

The product of its digits is 193536, while the sum is 43.

The square root of 64388761 is about 8024.2607759220. The cubic root of 64388761 is about 400.8082843409.

The spelling of 64388761 in words is "sixty-four million, three hundred eighty-eight thousand, seven hundred sixty-one".