83790778 has 4 divisors (see below), whose sum is σ = 125686170. Its totient is φ = 41895388.

The previous prime is 83790767. The next prime is 83790793. The reversal of 83790778 is 87709738.

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., 75742209 + 8048569 = 8703^2 + 2837^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20947693 + ... + 20947696.

Almost surely, 2^83790778 is an apocalyptic number.

83790778 is a deficient number, since it is larger than the sum of its proper divisors (41895392).

83790778 is a wasteful number, since it uses less digits than its factorization.

83790778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41895391.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 83790778 is about 9153.7302778703. The cubic root of 83790778 is about 437.5880038477.

The spelling of 83790778 in words is "eighty-three million, seven hundred ninety thousand, seven hundred seventy-eight".