78722730 has 24 divisors (see below), whose sum is σ = 204679332. Its totient is φ = 20992704.

The previous prime is 78722687. The next prime is 78722731. The reversal of 78722730 is 3722787.

It can be written as a sum of positive squares in 2 ways, for example, as 74597769 + 4124961 = 8637^2 + 2031^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78722731) 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 11 ways as a sum of consecutive naturals, for example, 437259 + ... + 437438.

Almost surely, 2^78722730 is an apocalyptic number.

78722730 is an abundant number, since it is smaller than the sum of its proper divisors (125956602).

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

78722730 is a wasteful number, since it uses less digits than its factorization.

78722730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874710 (or 874707 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 78722730 is about 8872.5830511751. The cubic root of 78722730 is about 428.5814621460.

The spelling of 78722730 in words is "seventy-eight million, seven hundred twenty-two thousand, seven hundred thirty".