78728722 has 8 divisors (see below), whose sum is σ = 118132236. Its totient is φ = 39351312.

The previous prime is 78728719. The next prime is 78728813. The reversal of 78728722 is 22782787.

It can be written as a sum of positive squares in 2 ways, for example, as 76930441 + 1798281 = 8771^2 + 1341^2 .

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

It is a nialpdrome in base 14.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5308 + ... + 13624.

Almost surely, 2^78728722 is an apocalyptic number.

78728722 is a deficient number, since it is larger than the sum of its proper divisors (39403514).

78728722 is a wasteful number, since it uses less digits than its factorization.

78728722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052.

The product of its digits is 175616, while the sum is 43.

The square root of 78728722 is about 8872.9207141730. The cubic root of 78728722 is about 428.5923357314.

The spelling of 78728722 in words is "seventy-eight million, seven hundred twenty-eight thousand, seven hundred twenty-two".