64877617 has 6 divisors (see below), whose sum is σ = 75469938. Its totient is φ = 55609344.

The previous prime is 64877597. The next prime is 64877651. The reversal of 64877617 is 71677846.

It can be written as a sum of positive squares in only one way, i.e., 60699681 + 4177936 = 7791^2 + 2044^2 .

It is not a de Polignac number, because 64877617 - 2⁷ = 64877489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64871617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 661968 + ... + 662065.

It is an arithmetic number, because the mean of its divisors is an integer number (12578323).

Almost surely, 2^64877617 is an apocalyptic number.

It is an amenable number.

64877617 is a deficient number, since it is larger than the sum of its proper divisors (10592321).

64877617 is a wasteful number, since it uses less digits than its factorization.

64877617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324047 (or 1324040 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 64877617 is about 8054.6643008880. The cubic root of 64877617 is about 401.8200745109.

The spelling of 64877617 in words is "sixty-four million, eight hundred seventy-seven thousand, six hundred seventeen".