81073090 has 16 divisors (see below), whose sum is σ = 166779072. Its totient is φ = 27796464.

The previous prime is 81073081. The next prime is 81073129. The reversal of 81073090 is 9037018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579024 + ... + 579163.

It is an arithmetic number, because the mean of its divisors is an integer number (10423692).

Almost surely, 2^81073090 is an apocalyptic number.

81073090 is an abundant number, since it is smaller than the sum of its proper divisors (85705982).

81073090 is a wasteful number, since it uses less digits than its factorization.

81073090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158201.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 81073090 is about 9004.0596399624. The cubic root of 81073090 is about 432.8049727346.

The spelling of 81073090 in words is "eighty-one million, seventy-three thousand, ninety".