78542005 has 8 divisors (see below), whose sum is σ = 97500600. Its totient is φ = 60666816.

The previous prime is 78541993. The next prime is 78542017. The reversal of 78542005 is 50024587.

It is an interprime number because it is at equal distance from previous prime (78541993) and next prime (78542017).

It can be written as a sum of positive squares in 4 ways, for example, as 30669444 + 47872561 = 5538^2 + 6919^2 .

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 78542005 - 2⁵ = 78541973 is a prime.

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, 270690 + ... + 270979.

It is an arithmetic number, because the mean of its divisors is an integer number (12187575).

Almost surely, 2^78542005 is an apocalyptic number.

It is an amenable number.

78542005 is a deficient number, since it is larger than the sum of its proper divisors (18958595).

78542005 is a wasteful number, since it uses less digits than its factorization.

78542005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541703.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 78542005 is about 8862.3927355991. The cubic root of 78542005 is about 428.2532438017.

The spelling of 78542005 in words is "seventy-eight million, five hundred forty-two thousand, five".