77991395 has 8 divisors (see below), whose sum is σ = 94555104. Its totient is φ = 61749504.

The previous prime is 77991383. The next prime is 77991401. The reversal of 77991395 is 59319977.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77991395 - 2⁸ = 77991139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 79919 + ... + 80888.

It is an arithmetic number, because the mean of its divisors is an integer number (11819388).

Almost surely, 2^77991395 is an apocalyptic number.

77991395 is a deficient number, since it is larger than the sum of its proper divisors (16563709).

77991395 is a wasteful number, since it uses less digits than its factorization.

77991395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160909.

The product of its digits is 535815, while the sum is 50.

The square root of 77991395 is about 8831.2736906972. The cubic root of 77991395 is about 427.2501555287.

The spelling of 77991395 in words is "seventy-seven million, nine hundred ninety-one thousand, three hundred ninety-five".