64743525 has 144 divisors (see below), whose sum is σ = 149954688. Its totient is φ = 25920000.

The previous prime is 64743521. The next prime is 64743529. The reversal of 64743525 is 52534746.

64743525 is a `hidden beast` number, since 64 + 74 + 3 + 525 = 666.

It is an interprime number because it is at equal distance from previous prime (64743521) and next prime (64743529).

It is not a de Polignac number, because 64743525 - 2² = 64743521 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64743525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64743521) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 640975 + ... + 641075.

It is an arithmetic number, because the mean of its divisors is an integer number (1041352).

Almost surely, 2^64743525 is an apocalyptic number.

It is an amenable number.

64743525 is an abundant number, since it is smaller than the sum of its proper divisors (85211163).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64743525 is a wasteful number, since it uses less digits than its factorization.

64743525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 164 counting only the distinct ones).

The product of its digits is 100800, while the sum is 36.

The square root of 64743525 is about 8046.3361227331. The cubic root of 64743525 is about 401.5430502523.

It can be divided in two parts, 6474 and 3525, that added together give a palindrome (9999).

The spelling of 64743525 in words is "sixty-four million, seven hundred forty-three thousand, five hundred twenty-five".