78538291 has 8 divisors (see below), whose sum is σ = 85739360. Its totient is φ = 71502912.

The previous prime is 78538289. The next prime is 78538297. The reversal of 78538291 is 19283587.

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

It is not a de Polignac number, because 78538291 - 2¹ = 78538289 is a prime.

It is a super-3 number, since 3×78538291³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78538297) 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, 40431 + ... + 42328.

It is an arithmetic number, because the mean of its divisors is an integer number (10717420).

Almost surely, 2^78538291 is an apocalyptic number.

78538291 is a deficient number, since it is larger than the sum of its proper divisors (7201069).

78538291 is a wasteful number, since it uses less digits than its factorization.

78538291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82845.

The product of its digits is 120960, while the sum is 43.

The square root of 78538291 is about 8862.1831960302. The cubic root of 78538291 is about 428.2464934536.

The spelling of 78538291 in words is "seventy-eight million, five hundred thirty-eight thousand, two hundred ninety-one".