64891825 has 12 divisors (see below), whose sum is σ = 80678988. Its totient is φ = 51776000.

The previous prime is 64891777. The next prime is 64891829. The reversal of 64891825 is 52819846.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 57121 + 64834704 = 239^2 + 8052^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64891825 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 (64891829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6789 + ... + 13261.

It is an arithmetic number, because the mean of its divisors is an integer number (6723249).

Almost surely, 2^64891825 is an apocalyptic number.

It is an amenable number.

64891825 is a deficient number, since it is larger than the sum of its proper divisors (15787163).

64891825 is a wasteful number, since it uses less digits than its factorization.

64891825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6884 (or 6879 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 64891825 is about 8055.5462260482. The cubic root of 64891825 is about 401.8494048263.

The spelling of 64891825 in words is "sixty-four million, eight hundred ninety-one thousand, eight hundred twenty-five".