78726905 has 16 divisors (see below), whose sum is σ = 96422400. Its totient is φ = 61690560.

The previous prime is 78726877. The next prime is 78726931. The reversal of 78726905 is 50962787.

It is not a de Polignac number, because 78726905 - 2⁶ = 78726841 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109136 + ... + 109854.

It is an arithmetic number, because the mean of its divisors is an integer number (6026400).

Almost surely, 2^78726905 is an apocalyptic number.

It is an amenable number.

78726905 is a deficient number, since it is larger than the sum of its proper divisors (17695495).

78726905 is a wasteful number, since it uses less digits than its factorization.

78726905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 78726905 is about 8872.8183233965. The cubic root of 78726905 is about 428.5890385092.

The spelling of 78726905 in words is "seventy-eight million, seven hundred twenty-six thousand, nine hundred five".