72870161 has 16 divisors (see below), whose sum is σ = 91878528. Its totient is φ = 56246400.

The previous prime is 72870157. The next prime is 72870167. The reversal of 72870161 is 16107827.

It is not a de Polignac number, because 72870161 - 2² = 72870157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72870167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6035 + ... + 13496.

It is an arithmetic number, because the mean of its divisors is an integer number (5742408).

Almost surely, 2^72870161 is an apocalyptic number.

It is an amenable number.

72870161 is a deficient number, since it is larger than the sum of its proper divisors (19008367).

72870161 is a wasteful number, since it uses less digits than its factorization.

With its successor (72870162) it forms an eRAP, since the sums of their prime factors are consecutive (19592 and 19593).

72870161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19592.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 72870161 is about 8536.4021109599. The cubic root of 72870161 is about 417.6859912102.

Adding to 72870161 its reverse (16107827), we get a palindrome (88977988).

The spelling of 72870161 in words is "seventy-two million, eight hundred seventy thousand, one hundred sixty-one".