3639817725 has 72 divisors (see below), whose sum is σ = 6600077568. Its totient is φ = 1767782400.

The previous prime is 3639817717. The next prime is 3639817729. The reversal of 3639817725 is 5277189363.

It is not a de Polignac number, because 3639817725 - 2³ = 3639817717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639817729) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 669217 + ... + 674633.

It is an arithmetic number, because the mean of its divisors is an integer number (91667744).

Almost surely, 2^3639817725 is an apocalyptic number.

It is an amenable number.

3639817725 is a deficient number, since it is larger than the sum of its proper divisors (2960259843).

3639817725 is a wasteful number, since it uses less digits than its factorization.

3639817725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5495 (or 5473 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 3639817725 is about 60330.9019077288. The cubic root of 3639817725 is about 1538.2486591234.

The spelling of 3639817725 in words is "three billion, six hundred thirty-nine million, eight hundred seventeen thousand, seven hundred twenty-five".