64525405 has 12 divisors (see below), whose sum is σ = 90072540. Its totient is φ = 44245824.

The previous prime is 64525403. The next prime is 64525411. The reversal of 64525405 is 50452546.

It can be written as a sum of positive squares in 2 ways, for example, as 47927929 + 16597476 = 6923^2 + 4074^2 .

It is not a de Polignac number, because 64525405 - 2¹ = 64525403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64525403) 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, 131440 + ... + 131929.

It is an arithmetic number, because the mean of its divisors is an integer number (7506045).

Almost surely, 2^64525405 is an apocalyptic number.

It is an amenable number.

64525405 is a deficient number, since it is larger than the sum of its proper divisors (25547135).

64525405 is a wasteful number, since it uses less digits than its factorization.

64525405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263388 (or 263381 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 64525405 is about 8032.7706926066. The cubic root of 64525405 is about 401.0916119981.

The spelling of 64525405 in words is "sixty-four million, five hundred twenty-five thousand, four hundred five".