78393261 has 8 divisors (see below), whose sum is σ = 104621920. Its totient is φ = 52213392.

The previous prime is 78393253. The next prime is 78393281. The reversal of 78393261 is 16239387.

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

It is not a de Polignac number, because 78393261 - 2³ = 78393253 is a prime.

It is a super-2 number, since 2×78393261² = 12291006740428242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78393281) 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, 8266 + ... + 15003.

It is an arithmetic number, because the mean of its divisors is an integer number (13077740).

Almost surely, 2^78393261 is an apocalyptic number.

It is an amenable number.

78393261 is a deficient number, since it is larger than the sum of its proper divisors (26228659).

78393261 is a wasteful number, since it uses less digits than its factorization.

78393261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24395.

The product of its digits is 54432, while the sum is 39.

The square root of 78393261 is about 8853.9968940586. The cubic root of 78393261 is about 427.9827288719.

The spelling of 78393261 in words is "seventy-eight million, three hundred ninety-three thousand, two hundred sixty-one".