64667725 has 6 divisors (see below), whose sum is σ = 80188010. Its totient is φ = 51734160.

The previous prime is 64667719. The next prime is 64667731. The reversal of 64667725 is 52776646.

64667725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64667719) and next prime (64667731).

It can be written as a sum of positive squares in 3 ways, for example, as 715716 + 63952009 = 846^2 + 7997^2 .

It is not a de Polignac number, because 64667725 - 2⁵ = 64667693 is a prime.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1293330 + ... + 1293379.

Almost surely, 2^64667725 is an apocalyptic number.

It is an amenable number.

64667725 is a deficient number, since it is larger than the sum of its proper divisors (15520285).

64667725 is a wasteful number, since it uses less digits than its factorization.

64667725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586719 (or 2586714 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 64667725 is about 8041.6245249328. The cubic root of 64667725 is about 401.3862837432.

The spelling of 64667725 in words is "sixty-four million, six hundred sixty-seven thousand, seven hundred twenty-five".