77738399 has 8 divisors (see below), whose sum is σ = 82601280. Its totient is φ = 73160928.

The previous prime is 77738317. The next prime is 77738407. The reversal of 77738399 is 99383777.

It is a happy number.

It is not a de Polignac number, because 77738399 - 2¹² = 77734303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77738399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77738599) 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, 2999 + ... + 12824.

It is an arithmetic number, because the mean of its divisors is an integer number (10325160).

Almost surely, 2^77738399 is an apocalyptic number.

77738399 is a deficient number, since it is larger than the sum of its proper divisors (4862881).

77738399 is an equidigital number, since it uses as much as digits as its factorization.

77738399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15874 (or 15840 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 53.

The square root of 77738399 is about 8816.9381873755. The cubic root of 77738399 is about 426.7876700122.

The spelling of 77738399 in words is "seventy-seven million, seven hundred thirty-eight thousand, three hundred ninety-nine".