64708861 has 12 divisors (see below), whose sum is σ = 76511100. Its totient is φ = 54552960.

The previous prime is 64708849. The next prime is 64708877. The reversal of 64708861 is 16880746.

It can be written as a sum of positive squares in 2 ways, for example, as 10686361 + 54022500 = 3269^2 + 7350^2 .

It is not a de Polignac number, because 64708861 - 2⁹ = 64708349 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 (64708261) 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 11 ways as a sum of consecutive naturals, for example, 7836 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (6375925).

Almost surely, 2^64708861 is an apocalyptic number.

64708861 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64708861 is a deficient number, since it is larger than the sum of its proper divisors (11802239).

64708861 is a wasteful number, since it uses less digits than its factorization.

64708861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21724 (or 21717 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 64708861 is about 8044.1818104764. The cubic root of 64708861 is about 401.4713747545.

The spelling of 64708861 in words is "sixty-four million, seven hundred eight thousand, eight hundred sixty-one".