79781472 has 72 divisors (see below), whose sum is σ = 233041536. Its totient is φ = 25871616.

The previous prime is 79781467. The next prime is 79781477. The reversal of 79781472 is 27418797.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79781467) and next prime (79781477).

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79781477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6913 + ... + 14399.

It is an arithmetic number, because the mean of its divisors is an integer number (3236688).

Almost surely, 2^79781472 is an apocalyptic number.

79781472 is a gapful number since it is divisible by the number (72) 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 79781472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116520768).

79781472 is an abundant number, since it is smaller than the sum of its proper divisors (153260064).

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

79781472 is a wasteful number, since it uses less digits than its factorization.

79781472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7540 (or 7529 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 79781472 is about 8932.0474696455. The cubic root of 79781472 is about 430.4942433075.

The spelling of 79781472 in words is "seventy-nine million, seven hundred eighty-one thousand, four hundred seventy-two".