64505825 has 12 divisors (see below), whose sum is σ = 80528700. Its totient is φ = 51255360.

The previous prime is 64505809. The next prime is 64505851. The reversal of 64505825 is 52850546.

It can be written as a sum of positive squares in 6 ways, for example, as 1763584 + 62742241 = 1328^2 + 7921^2 .

It is not a de Polignac number, because 64505825 - 2⁴ = 64505809 is a prime.

It is a super-2 number, since 2×64505825² = 8322002917861250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4934 + ... + 12383.

It is an arithmetic number, because the mean of its divisors is an integer number (6710725).

Almost surely, 2^64505825 is an apocalyptic number.

It is an amenable number.

64505825 is a deficient number, since it is larger than the sum of its proper divisors (16022875).

64505825 is a wasteful number, since it uses less digits than its factorization.

64505825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476 (or 17471 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 64505825 is about 8031.5518425769. The cubic root of 64505825 is about 401.0510379625.

The spelling of 64505825 in words is "sixty-four million, five hundred five thousand, eight hundred twenty-five".