708399778 has 4 divisors (see below), whose sum is σ = 1062599670. Its totient is φ = 354199888.

The previous prime is 708399773. The next prime is 708399779. The reversal of 708399778 is 877993807.

It is a happy number.

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., 621853969 + 86545809 = 24937^2 + 9303^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (708399773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177099943 + ... + 177099946.

Almost surely, 2^708399778 is an apocalyptic number.

708399778 is a deficient number, since it is larger than the sum of its proper divisors (354199892).

708399778 is a wasteful number, since it uses less digits than its factorization.

708399778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354199891.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The square root of 708399778 is about 26615.7806197752. The cubic root of 708399778 is about 891.4414121236.

The spelling of 708399778 in words is "seven hundred eight million, three hundred ninety-nine thousand, seven hundred seventy-eight".