72704121 has 16 divisors (see below), whose sum is σ = 117304704. Its totient is φ = 39101184.

The previous prime is 72704117. The next prime is 72704153. The reversal of 72704121 is 12140727.

It is not a de Polignac number, because 72704121 - 2² = 72704117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72704091 and 72704100.

It is not an unprimeable number, because it can be changed into a prime (72704101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101470 + ... + 102183.

It is an arithmetic number, because the mean of its divisors is an integer number (7331544).

Almost surely, 2^72704121 is an apocalyptic number.

It is an amenable number.

72704121 is a deficient number, since it is larger than the sum of its proper divisors (44600583).

72704121 is a wasteful number, since it uses less digits than its factorization.

72704121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203680.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 72704121 is about 8526.6711558497. The cubic root of 72704121 is about 417.3685072415.

Adding to 72704121 its reverse (12140727), we get a palindrome (84844848).

The spelling of 72704121 in words is "seventy-two million, seven hundred four thousand, one hundred twenty-one".