81206378 has 8 divisors (see below), whose sum is σ = 132883200. Its totient is φ = 36911980.

The previous prime is 81206327. The next prime is 81206383. The reversal of 81206378 is 87360218.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845578 + ... + 1845621.

It is an arithmetic number, because the mean of its divisors is an integer number (16610400).

Almost surely, 2^81206378 is an apocalyptic number.

81206378 is a deficient number, since it is larger than the sum of its proper divisors (51676822).

81206378 is a wasteful number, since it uses less digits than its factorization.

81206378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691212.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81206378 is about 9011.4581505992. The cubic root of 81206378 is about 433.0420268310.

The spelling of 81206378 in words is "eighty-one million, two hundred six thousand, three hundred seventy-eight".