78723330 has 64 divisors (see below), whose sum is σ = 217002240. Its totient is φ = 17904384.

The previous prime is 78723329. The next prime is 78723331. The reversal of 78723330 is 3332787.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78723329) and next prime (78723331).

It is a junction number, because it is equal to n+sod(n) for n = 78723291 and 78723300.

It is not an unprimeable number, because it can be changed into a prime (78723331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47272 + ... + 48908.

It is an arithmetic number, because the mean of its divisors is an integer number (3390660).

Almost surely, 2^78723330 is an apocalyptic number.

78723330 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78723330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108501120).

78723330 is an abundant number, since it is smaller than the sum of its proper divisors (138278910).

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

78723330 is a wasteful number, since it uses less digits than its factorization.

78723330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883.

The product of its (nonzero) digits is 21168, while the sum is 33.

The square root of 78723330 is about 8872.6168631357. The cubic root of 78723330 is about 428.5825509812.

The spelling of 78723330 in words is "seventy-eight million, seven hundred twenty-three thousand, three hundred thirty".