3638070721 has 8 divisors (see below), whose sum is σ = 3694076064. Its totient is φ = 3582115680.

The previous prime is 3638070713. The next prime is 3638070739. The reversal of 3638070721 is 1270708363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3638070721 - 2³ = 3638070713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3638070521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148986 + ... + 171676.

It is an arithmetic number, because the mean of its divisors is an integer number (461759508).

Almost surely, 2^3638070721 is an apocalyptic number.

It is an amenable number.

3638070721 is a deficient number, since it is larger than the sum of its proper divisors (56005343).

3638070721 is a wasteful number, since it uses less digits than its factorization.

3638070721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25151.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 3638070721 is about 60316.4216528136. The cubic root of 3638070721 is about 1538.0025152390.

The spelling of 3638070721 in words is "three billion, six hundred thirty-eight million, seventy thousand, seven hundred twenty-one".