72707121 has 24 divisors (see below), whose sum is σ = 108842240. Its totient is φ = 46720800.

The previous prime is 72707111. The next prime is 72707189. The reversal of 72707121 is 12170727.

It is not a de Polignac number, because 72707121 - 2⁹ = 72706609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72707101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117150 + ... + 117768.

Almost surely, 2^72707121 is an apocalyptic number.

It is an amenable number.

72707121 is a deficient number, since it is larger than the sum of its proper divisors (36135119).

72707121 is a wasteful number, since it uses less digits than its factorization.

72707121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 72707121 is about 8526.8470726289. The cubic root of 72707121 is about 417.3742478070.

Adding to 72707121 its reverse (12170727), we get a palindrome (84877848).

The spelling of 72707121 in words is "seventy-two million, seven hundred seven thousand, one hundred twenty-one".