64405125 has 40 divisors (see below), whose sum is σ = 120089112. Its totient is φ = 34344000.

The previous prime is 64405109. The next prime is 64405127. The reversal of 64405125 is 52150446.

64405125 is a `hidden beast` number, since 644 + 0 + 5 + 12 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7387524 + 57017601 = 2718^2 + 7551^2 .

It is not a de Polignac number, because 64405125 - 2⁴ = 64405109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64405127) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6945 + ... + 13305.

Almost surely, 2^64405125 is an apocalyptic number.

It is an amenable number.

64405125 is a deficient number, since it is larger than the sum of its proper divisors (55683987).

64405125 is an equidigital number, since it uses as much as digits as its factorization.

64405125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388 (or 6369 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 64405125 is about 8025.2803689342. The cubic root of 64405125 is about 400.8422357693.

The spelling of 64405125 in words is "sixty-four million, four hundred five thousand, one hundred twenty-five".