78881906 has 8 divisors (see below), whose sum is σ = 120262764. Its totient is φ = 38794320.

The previous prime is 78881897. The next prime is 78881911. The reversal of 78881906 is 60918887.

It can be written as a sum of positive squares in 2 ways, for example, as 78765625 + 116281 = 8875^2 + 341^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323165 + ... + 323408.

Almost surely, 2^78881906 is an apocalyptic number.

78881906 is a deficient number, since it is larger than the sum of its proper divisors (41380858).

78881906 is a wasteful number, since it uses less digits than its factorization.

78881906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646636.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 78881906 is about 8881.5486262250. The cubic root of 78881906 is about 428.8701291109.

The spelling of 78881906 in words is "seventy-eight million, eight hundred eighty-one thousand, nine hundred six".