78973138 has 8 divisors (see below), whose sum is σ = 118734588. Its totient is φ = 39394944.

The previous prime is 78973121. The next prime is 78973183. The reversal of 78973138 is 83137987.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78375609 + 597529 = 8853^2 + 773^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44731 + ... + 46462.

Almost surely, 2^78973138 is an apocalyptic number.

78973138 is a deficient number, since it is larger than the sum of its proper divisors (39761450).

78973138 is a wasteful number, since it uses less digits than its factorization.

78973138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91628.

The product of its digits is 254016, while the sum is 46.

The square root of 78973138 is about 8886.6831832805. The cubic root of 78973138 is about 429.0354040436.

The spelling of 78973138 in words is "seventy-eight million, nine hundred seventy-three thousand, one hundred thirty-eight".