79490789820 has 288 divisors, whose sum is σ = 273960960000. Its totient is φ = 18494811648.

The previous prime is 79490789803. The next prime is 79490789827. The reversal of 79490789820 is 2898709497.

79490789820 is a `hidden beast` number, since 79 + 490 + 78 + 9 + 8 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79490789827) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22183749 + ... + 22187331.

Almost surely, 2^79490789820 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 79490789820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136980480000).

79490789820 is an abundant number, since it is smaller than the sum of its proper divisors (194470170180).

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

79490789820 is a wasteful number, since it uses less digits than its factorization.

79490789820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4124 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 79490789820 in words is "seventy-nine billion, four hundred ninety million, seven hundred eighty-nine thousand, eight hundred twenty".