81203678 has 16 divisors (see below), whose sum is σ = 125450160. Its totient is φ = 39393216.

The previous prime is 81203677. The next prime is 81203711. The reversal of 81203678 is 87630218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81203677) 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, 28925 + ... + 31607.

It is an arithmetic number, because the mean of its divisors is an integer number (7840635).

Almost surely, 2^81203678 is an apocalyptic number.

81203678 is a deficient number, since it is larger than the sum of its proper divisors (44246482).

81203678 is a wasteful number, since it uses less digits than its factorization.

81203678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81203678 is about 9011.3083400803. The cubic root of 81203678 is about 433.0372274279.

The spelling of 81203678 in words is "eighty-one million, two hundred three thousand, six hundred seventy-eight".