77399791 has 4 divisors (see below), whose sum is σ = 88456912. Its totient is φ = 66342672.

The previous prime is 77399771. The next prime is 77399797. The reversal of 77399791 is 19799377.

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

It is a cyclic number.

It is not a de Polignac number, because 77399791 - 2¹¹ = 77397743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77399797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5528550 + ... + 5528563.

It is an arithmetic number, because the mean of its divisors is an integer number (22114228).

Almost surely, 2^77399791 is an apocalyptic number.

77399791 is a deficient number, since it is larger than the sum of its proper divisors (11057121).

77399791 is a wasteful number, since it uses less digits than its factorization.

77399791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11057120.

The product of its digits is 750141, while the sum is 52.

The square root of 77399791 is about 8797.7151010930. The cubic root of 77399791 is about 426.1671098956.

The spelling of 77399791 in words is "seventy-seven million, three hundred ninety-nine thousand, seven hundred ninety-one".