78239473 has 8 divisors (see below), whose sum is σ = 88692800. Its totient is φ = 68419728.

The previous prime is 78239459. The next prime is 78239479. The reversal of 78239473 is 37493287.

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

It is not a de Polignac number, because 78239473 - 2²¹ = 76142321 is a prime.

It is a super-2 number, since 2×78239473² = 12242830270635458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78239479) 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, 158133 + ... + 158626.

It is an arithmetic number, because the mean of its divisors is an integer number (11086600).

Almost surely, 2^78239473 is an apocalyptic number.

It is an amenable number.

78239473 is a deficient number, since it is larger than the sum of its proper divisors (10453327).

78239473 is a wasteful number, since it uses less digits than its factorization.

78239473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316791.

The product of its digits is 254016, while the sum is 43.

The square root of 78239473 is about 8845.3079652435. The cubic root of 78239473 is about 427.7026805874.

The spelling of 78239473 in words is "seventy-eight million, two hundred thirty-nine thousand, four hundred seventy-three".