78506405 has 8 divisors (see below), whose sum is σ = 94282272. Its totient is φ = 62755408.

The previous prime is 78506399. The next prime is 78506413. The reversal of 78506405 is 50460587.

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

It is a cyclic number.

It is not a de Polignac number, because 78506405 - 2⁸ = 78506149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1634 + ... + 12636.

It is an arithmetic number, because the mean of its divisors is an integer number (11785284).

Almost surely, 2^78506405 is an apocalyptic number.

It is an amenable number.

78506405 is a deficient number, since it is larger than the sum of its proper divisors (15775867).

78506405 is a wasteful number, since it uses less digits than its factorization.

78506405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12435.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 78506405 is about 8860.3840210230. The cubic root of 78506405 is about 428.1885305760.

The spelling of 78506405 in words is "seventy-eight million, five hundred six thousand, four hundred five".