75778385 has 4 divisors (see below), whose sum is σ = 90934068. Its totient is φ = 60622704.

The previous prime is 75778349. The next prime is 75778433. The reversal of 75778385 is 58387757.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58387757 = 59 ⋅989623.

It can be written as a sum of positive squares in 2 ways, for example, as 28430224 + 47348161 = 5332^2 + 6881^2 .

It is a cyclic number.

It is not a de Polignac number, because 75778385 - 2⁶ = 75778321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7577834 + ... + 7577843.

It is an arithmetic number, because the mean of its divisors is an integer number (22733517).

Almost surely, 2^75778385 is an apocalyptic number.

It is an amenable number.

75778385 is a deficient number, since it is larger than the sum of its proper divisors (15155683).

75778385 is a wasteful number, since it uses less digits than its factorization.

75778385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15155682.

The product of its digits is 1646400, while the sum is 50.

The square root of 75778385 is about 8705.0781156748. The cubic root of 75778385 is about 423.1702373911.

The spelling of 75778385 in words is "seventy-five million, seven hundred seventy-eight thousand, three hundred eighty-five".