78731330 has 8 divisors (see below), whose sum is σ = 141716412. Its totient is φ = 31492528.

The previous prime is 78731309. The next prime is 78731333. The reversal of 78731330 is 3313787.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 744769 = 8831^2 + 863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78731333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3936557 + ... + 3936576.

Almost surely, 2^78731330 is an apocalyptic number.

78731330 is a deficient number, since it is larger than the sum of its proper divisors (62985082).

78731330 is a wasteful number, since it uses less digits than its factorization.

78731330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7873140.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 78731330 is about 8873.0676769649. The cubic root of 78731330 is about 428.5970682544.

The spelling of 78731330 in words is "seventy-eight million, seven hundred thirty-one thousand, three hundred thirty".