68644525 has 6 divisors (see below), whose sum is σ = 85119242. Its totient is φ = 54915600.

The previous prime is 68644523. The next prime is 68644559. The reversal of 68644525 is 52544686.

It can be written as a sum of positive squares in 3 ways, for example, as 16024009 + 52620516 = 4003^2 + 7254^2 .

It is not a de Polignac number, because 68644525 - 2¹ = 68644523 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 (68644523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1372866 + ... + 1372915.

Almost surely, 2^68644525 is an apocalyptic number.

It is an amenable number.

68644525 is a deficient number, since it is larger than the sum of its proper divisors (16474717).

68644525 is a wasteful number, since it uses less digits than its factorization.

68644525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745791 (or 2745786 counting only the distinct ones).

The product of its digits is 230400, while the sum is 40.

The square root of 68644525 is about 8285.1991527060. The cubic root of 68644525 is about 409.4510301068.

It can be divided in two parts, 68644 and 525, that added together give a square (69169 = 263²).

The spelling of 68644525 in words is "sixty-eight million, six hundred forty-four thousand, five hundred twenty-five".