74004780781 has 4 divisors (see below), whose sum is σ = 74096032864. Its totient is φ = 73913528700.

The previous prime is 74004780779. The next prime is 74004780793. The reversal of 74004780781 is 18708740047.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18708740047 = 22063 ⋅847969.

It is a cyclic number.

It is not a de Polignac number, because 74004780781 - 2¹ = 74004780779 is a prime.

It is a super-2 number, since 2×74004780781² (a number of 23 digits) 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 (74004780761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45624825 + ... + 45626446.

It is an arithmetic number, because the mean of its divisors is an integer number (18524008216).

Almost surely, 2^74004780781 is an apocalyptic number.

It is an amenable number.

74004780781 is a deficient number, since it is larger than the sum of its proper divisors (91252083).

74004780781 is an equidigital number, since it uses as much as digits as its factorization.

74004780781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91252082.

The product of its (nonzero) digits is 351232, while the sum is 46.

The spelling of 74004780781 in words is "seventy-four billion, four million, seven hundred eighty thousand, seven hundred eighty-one".