73155681 has 24 divisors (see below), whose sum is σ = 111621120. Its totient is φ = 46041696.

The previous prime is 73155673. The next prime is 73155701. The reversal of 73155681 is 18655137.

It is not a de Polignac number, because 73155681 - 2³ = 73155673 is a prime.

It is a super-2 number, since 2×73155681² = 10703507325147522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73155281) 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, 64935 + ... + 66051.

It is an arithmetic number, because the mean of its divisors is an integer number (4650880).

Almost surely, 2^73155681 is an apocalyptic number.

It is an amenable number.

73155681 is a deficient number, since it is larger than the sum of its proper divisors (38465439).

73155681 is a wasteful number, since it uses less digits than its factorization.

73155681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1522 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 73155681 is about 8553.1094345858. The cubic root of 73155681 is about 418.2308062720.

It can be divided in two parts, 7315 and 5681, that added together give a square (12996 = 114²).

The spelling of 73155681 in words is "seventy-three million, one hundred fifty-five thousand, six hundred eighty-one".