85781074 has 4 divisors (see below), whose sum is σ = 128671614. Its totient is φ = 42890536.

The previous prime is 85781071. The next prime is 85781107. The reversal of 85781074 is 47018758.

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

It can be written as a sum of positive squares in only one way, i.e., 64112049 + 21669025 = 8007^2 + 4655^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (85781071) 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 as a sum of consecutive naturals, namely, 21445267 + ... + 21445270.

Almost surely, 2^85781074 is an apocalyptic number.

85781074 is a deficient number, since it is larger than the sum of its proper divisors (42890540).

85781074 is a wasteful number, since it uses less digits than its factorization.

85781074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42890539.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 85781074 is about 9261.8072750409. The cubic root of 85781074 is about 441.0256274068.

The spelling of 85781074 in words is "eighty-five million, seven hundred eighty-one thousand, seventy-four".