79290930781 has 8 divisors (see below), whose sum is σ = 81229103928. Its totient is φ = 77352960000.

The previous prime is 79290930751. The next prime is 79290930793. The reversal of 79290930781 is 18703909297.

It can be written as a sum of positive squares in 4 ways, for example, as 18079222681 + 61211708100 = 134459^2 + 247410^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79290930781 - 2⁹ = 79290930269 is a prime.

It is a super-2 number, since 2×79290930781² (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 (79290930731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011871 + ... + 1087411.

It is an arithmetic number, because the mean of its divisors is an integer number (10153637991).

Almost surely, 2^79290930781 is an apocalyptic number.

It is an amenable number.

79290930781 is a deficient number, since it is larger than the sum of its proper divisors (1938173147).

79290930781 is a wasteful number, since it uses less digits than its factorization.

79290930781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101183.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 79290930781 in words is "seventy-nine billion, two hundred ninety million, nine hundred thirty thousand, seven hundred eighty-one".