104072781 has 4 divisors (see below), whose sum is σ = 138763712. Its totient is φ = 69381852.

The previous prime is 104072743. The next prime is 104072791. The reversal of 104072781 is 187270401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 104072781 - 2¹⁷ = 103941709 is a prime.

It is a super-2 number, since 2×104072781² = 21662287490147922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104072701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17345461 + ... + 17345466.

It is an arithmetic number, because the mean of its divisors is an integer number (34690928).

Almost surely, 2^104072781 is an apocalyptic number.

It is an amenable number.

104072781 is a deficient number, since it is larger than the sum of its proper divisors (34690931).

104072781 is an equidigital number, since it uses as much as digits as its factorization.

104072781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34690930.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 104072781 is about 10201.6067852079. The cubic root of 104072781 is about 470.3766122781.

The spelling of 104072781 in words is "one hundred four million, seventy-two thousand, seven hundred eighty-one".