90781073 has 4 divisors (see below), whose sum is σ = 90869988. Its totient is φ = 90692160.

The previous prime is 90781063. The next prime is 90781087. The reversal of 90781073 is 37018709.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78021889 + 12759184 = 8833^2 + 3572^2 .

It is a cyclic number.

It is not a de Polignac number, because 90781073 - 2¹² = 90776977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90781013) 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 3 ways as a sum of consecutive naturals, for example, 42908 + ... + 44973.

It is an arithmetic number, because the mean of its divisors is an integer number (22717497).

Almost surely, 2^90781073 is an apocalyptic number.

It is an amenable number.

90781073 is a deficient number, since it is larger than the sum of its proper divisors (88915).

90781073 is a wasteful number, since it uses less digits than its factorization.

90781073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88914.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 90781073 is about 9527.9102115837. The cubic root of 90781073 is about 449.4331512816.

The spelling of 90781073 in words is "ninety million, seven hundred eighty-one thousand, seventy-three".