78106394 has 16 divisors (see below), whose sum is σ = 120669696. Its totient is φ = 37893600.

The previous prime is 78106393. The next prime is 78106409. The reversal of 78106394 is 49360187.

It is a super-2 number, since 2×78106394² = 12201217567366472, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78106393) 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, 13169 + ... + 18155.

It is an arithmetic number, because the mean of its divisors is an integer number (7541856).

Almost surely, 2^78106394 is an apocalyptic number.

78106394 is a deficient number, since it is larger than the sum of its proper divisors (42563302).

78106394 is a wasteful number, since it uses less digits than its factorization.

78106394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78106394 is about 8837.7821878569. The cubic root of 78106394 is about 427.4600471081.

The spelling of 78106394 in words is "seventy-eight million, one hundred six thousand, three hundred ninety-four".