79869000781 has 4 divisors (see below), whose sum is σ = 79883604864. Its totient is φ = 79854396700.

The previous prime is 79869000779. The next prime is 79869000793. The reversal of 79869000781 is 18700096897.

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: 18700096897 = 75083 ⋅249059.

It is a cyclic number.

It is not a de Polignac number, because 79869000781 - 2¹ = 79869000779 is a prime.

It is a super-2 number, since 2×79869000781² (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 (79869000581) 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, 7293835 + ... + 7304776.

It is an arithmetic number, because the mean of its divisors is an integer number (19970901216).

Almost surely, 2^79869000781 is an apocalyptic number.

79869000781 is the 126388-th centered decagonal number.

It is an amenable number.

79869000781 is a deficient number, since it is larger than the sum of its proper divisors (14604083).

79869000781 is a wasteful number, since it uses less digits than its factorization.

79869000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14604082.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 79869000781 in words is "seventy-nine billion, eight hundred sixty-nine million, seven hundred eighty-one", and thus it is an aban number.