78728811 has 8 divisors (see below), whose sum is σ = 119967744. Its totient is φ = 44987880.

The previous prime is 78728719. The next prime is 78728813. The reversal of 78728811 is 11882787.

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

It is not a de Polignac number, because 78728811 - 2¹⁴ = 78712427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78728813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874475 + ... + 1874516.

It is an arithmetic number, because the mean of its divisors is an integer number (14995968).

Almost surely, 2^78728811 is an apocalyptic number.

78728811 is a deficient number, since it is larger than the sum of its proper divisors (41238933).

78728811 is a wasteful number, since it uses less digits than its factorization.

78728811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749001.

The product of its digits is 50176, while the sum is 42.

The square root of 78728811 is about 8872.9257294311. The cubic root of 78728811 is about 428.5924972341.

The spelling of 78728811 in words is "seventy-eight million, seven hundred twenty-eight thousand, eight hundred eleven".