81083078 has 4 divisors (see below), whose sum is σ = 121624620. Its totient is φ = 40541538.

The previous prime is 81083077. The next prime is 81083083. The reversal of 81083078 is 87038018.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81083077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20270768 + ... + 20270771.

It is an arithmetic number, because the mean of its divisors is an integer number (30406155).

Almost surely, 2^81083078 is an apocalyptic number.

81083078 is a deficient number, since it is larger than the sum of its proper divisors (40541542).

81083078 is a wasteful number, since it uses less digits than its factorization.

81083078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40541541.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81083078 is about 9004.6142615883. The cubic root of 81083078 is about 432.8227454981.

The spelling of 81083078 in words is "eighty-one million, eighty-three thousand, seventy-eight".