64688297 has 4 divisors (see below), whose sum is σ = 66192720. Its totient is φ = 63183876.

The previous prime is 64688287. The next prime is 64688303. The reversal of 64688297 is 79288646.

64688297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 64688297 - 2¹⁴ = 64671913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64688257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752147 + ... + 752232.

It is an arithmetic number, because the mean of its divisors is an integer number (16548180).

Almost surely, 2^64688297 is an apocalyptic number.

It is an amenable number.

64688297 is a deficient number, since it is larger than the sum of its proper divisors (1504423).

64688297 is a wasteful number, since it uses less digits than its factorization.

64688297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504422.

The product of its digits is 1161216, while the sum is 50.

The square root of 64688297 is about 8042.9035180089. The cubic root of 64688297 is about 401.4288420321.

The spelling of 64688297 in words is "sixty-four million, six hundred eighty-eight thousand, two hundred ninety-seven".