8074209781 has 4 divisors (see below), whose sum is σ = 8808228864. Its totient is φ = 7340190700.

The previous prime is 8074209779. The next prime is 8074209791. The reversal of 8074209781 is 1879024708.

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 a cyclic number.

It is not a de Polignac number, because 8074209781 - 2¹ = 8074209779 is a prime.

It is a super-2 number, since 2×8074209781² (a number of 21 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 (8074209751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367009525 + ... + 367009546.

It is an arithmetic number, because the mean of its divisors is an integer number (2202057216).

Almost surely, 2^8074209781 is an apocalyptic number.

It is an amenable number.

8074209781 is a deficient number, since it is larger than the sum of its proper divisors (734019083).

8074209781 is a wasteful number, since it uses less digits than its factorization.

8074209781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734019082.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 8074209781 is about 89856.6067743491. The cubic root of 8074209781 is about 2006.1651245092.

The spelling of 8074209781 in words is "eight billion, seventy-four million, two hundred nine thousand, seven hundred eighty-one".