78070858 has 4 divisors (see below), whose sum is σ = 117106290. Its totient is φ = 39035428.

The previous prime is 78070849. The next prime is 78070859. The reversal of 78070858 is 85807087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75811849 + 2259009 = 8707^2 + 1503^2 .

It is not an unprimeable number, because it can be changed into a prime (78070859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19517713 + ... + 19517716.

Almost surely, 2^78070858 is an apocalyptic number.

78070858 is a deficient number, since it is larger than the sum of its proper divisors (39035432).

78070858 is a wasteful number, since it uses less digits than its factorization.

78070858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39035431.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 78070858 is about 8835.7714999880. The cubic root of 78070858 is about 427.3952102288.

The spelling of 78070858 in words is "seventy-eight million, seventy thousand, eight hundred fifty-eight".