64688057 has 4 divisors (see below), whose sum is σ = 73929216. Its totient is φ = 55446900.

The previous prime is 64688053. The next prime is 64688059. The reversal of 64688057 is 75088646.

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 64688057 - 2² = 64688053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64687999 and 64688017.

It is not an unprimeable number, because it can be changed into a prime (64688053) 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, 4620569 + ... + 4620582.

It is an arithmetic number, because the mean of its divisors is an integer number (18482304).

Almost surely, 2^64688057 is an apocalyptic number.

It is an amenable number.

64688057 is a deficient number, since it is larger than the sum of its proper divisors (9241159).

64688057 is an equidigital number, since it uses as much as digits as its factorization.

64688057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9241158.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 64688057 is about 8042.8885980100. Note that the first 3 decimals coincide. The cubic root of 64688057 is about 401.4283455846.

The spelling of 64688057 in words is "sixty-four million, six hundred eighty-eight thousand, fifty-seven".