77280193 has 4 divisors (see below), whose sum is σ = 77844420. Its totient is φ = 76715968.

The previous prime is 77280169. The next prime is 77280197. The reversal of 77280193 is 39108277.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39727809 + 37552384 = 6303^2 + 6128^2 .

It is a cyclic number.

It is not a de Polignac number, because 77280193 - 2¹³ = 77272001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77280197) 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 3 ways as a sum of consecutive naturals, for example, 281908 + ... + 282181.

It is an arithmetic number, because the mean of its divisors is an integer number (19461105).

Almost surely, 2^77280193 is an apocalyptic number.

It is an amenable number.

77280193 is a deficient number, since it is larger than the sum of its proper divisors (564227).

77280193 is a wasteful number, since it uses less digits than its factorization.

77280193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564226.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 77280193 is about 8790.9153675826. The cubic root of 77280193 is about 425.9474925549.

The spelling of 77280193 in words is "seventy-seven million, two hundred eighty thousand, one hundred ninety-three".