79191700644 has 144 divisors (see below), whose sum is σ = 229849280640. Its totient is φ = 21084134400.

The previous prime is 79191700583. The next prime is 79191700649. The reversal of 79191700644 is 44600719197.

It is a junction number, because it is equal to n+sod(n) for n = 79191700593 and 79191700602.

It is not an unprimeable number, because it can be changed into a prime (79191700649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 970377 + ... + 1048815.

It is an arithmetic number, because the mean of its divisors is an integer number (1596175560).

Almost surely, 2^79191700644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79191700644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114924640320).

79191700644 is an abundant number, since it is smaller than the sum of its proper divisors (150657579996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79191700644 is a wasteful number, since it uses less digits than its factorization.

79191700644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78578 (or 78569 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 79191700644 in words is "seventy-nine billion, one hundred ninety-one million, seven hundred thousand, six hundred forty-four".