78721332 has 48 divisors (see below), whose sum is σ = 194073600. Its totient is φ = 24766560.

The previous prime is 78721327. The next prime is 78721333. The reversal of 78721332 is 23312787.

It is a super-2 number, since 2×78721332² = 12394096223708448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78721293 and 78721302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78721333) 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 15 ways as a sum of consecutive naturals, for example, 85957 + ... + 86867.

It is an arithmetic number, because the mean of its divisors is an integer number (4043200).

Almost surely, 2^78721332 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 78721332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97036800).

78721332 is an abundant number, since it is smaller than the sum of its proper divisors (115352268).

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

78721332 is a wasteful number, since it uses less digits than its factorization.

78721332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1314 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 78721332 is about 8872.5042688071. The cubic root of 78721332 is about 428.5789251387.

The spelling of 78721332 in words is "seventy-eight million, seven hundred twenty-one thousand, three hundred thirty-two".