77091790 has 16 divisors (see below), whose sum is σ = 138941568. Its totient is φ = 30797536.

The previous prime is 77091743. The next prime is 77091793. The reversal of 77091790 is 9719077.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77091793) 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 in 7 ways as a sum of consecutive naturals, for example, 4164 + ... + 13096.

It is an arithmetic number, because the mean of its divisors is an integer number (8683848).

Almost surely, 2^77091790 is an apocalyptic number.

77091790 is a deficient number, since it is larger than the sum of its proper divisors (61849778).

77091790 is a wasteful number, since it uses less digits than its factorization.

77091790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9803.

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 77091790 is about 8780.1930502695. The cubic root of 77091790 is about 425.6010687818.

The spelling of 77091790 in words is "seventy-seven million, ninety-one thousand, seven hundred ninety".