79491720 has 192 divisors, whose sum is σ = 302875200. Its totient is φ = 16504320.

The previous prime is 79491689. The next prime is 79491721. The reversal of 79491720 is 2719497.

It is not an unprimeable number, because it can be changed into a prime (79491721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64066 + ... + 65294.

It is an arithmetic number, because the mean of its divisors is an integer number (1577475).

Almost surely, 2^79491720 is an apocalyptic number.

79491720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79491720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151437600).

79491720 is an abundant number, since it is smaller than the sum of its proper divisors (223383480).

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

79491720 is a wasteful number, since it uses less digits than its factorization.

79491720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 79491720 is about 8915.8129186295. The cubic root of 79491720 is about 429.9724518137.

It can be divided in two parts, 7949 and 1720, that added together give a palindrome (9669).

The spelling of 79491720 in words is "seventy-nine million, four hundred ninety-one thousand, seven hundred twenty".