77691910 has 16 divisors (see below), whose sum is σ = 139967856. Its totient is φ = 31049568.

The previous prime is 77691883. The next prime is 77691917. The reversal of 77691910 is 1919677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77691917) 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 in 7 ways as a sum of consecutive naturals, for example, 11857 + ... + 17203.

It is an arithmetic number, because the mean of its divisors is an integer number (8747991).

Almost surely, 2^77691910 is an apocalyptic number.

77691910 is a deficient number, since it is larger than the sum of its proper divisors (62275946).

77691910 is a wasteful number, since it uses less digits than its factorization.

77691910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6807.

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 77691910 is about 8814.3014470802. The cubic root of 77691910 is about 426.7025774082.

The spelling of 77691910 in words is "seventy-seven million, six hundred ninety-one thousand, nine hundred ten".