64681425 has 36 divisors (see below), whose sum is σ = 117018304. Its totient is φ = 34149600.

The previous prime is 64681403. The next prime is 64681427. The reversal of 64681425 is 52418646.

64681425 is a `hidden beast` number, since 646 + 8 + 1 + 4 + 2 + 5 = 666.

It is not a de Polignac number, because 64681425 - 2¹² = 64677329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64681425.

It is not an unprimeable number, because it can be changed into a prime (64681427) 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 35 ways as a sum of consecutive naturals, for example, 21780 + ... + 24570.

Almost surely, 2^64681425 is an apocalyptic number.

It is an amenable number.

64681425 is a deficient number, since it is larger than the sum of its proper divisors (52336879).

64681425 is a wasteful number, since it uses less digits than its factorization.

64681425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910 (or 2902 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 64681425 is about 8042.4762977580. The cubic root of 64681425 is about 401.4146265979.

The spelling of 64681425 in words is "sixty-four million, six hundred eighty-one thousand, four hundred twenty-five".