77040785 has 4 divisors (see below), whose sum is σ = 92448948. Its totient is φ = 61632624.

The previous prime is 77040779. The next prime is 77040829. The reversal of 77040785 is 58704077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58704077 = 17 ⋅3453181.

It can be written as a sum of positive squares in 2 ways, for example, as 55100929 + 21939856 = 7423^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 77040785 - 2¹⁰ = 77039761 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, 7704074 + ... + 7704083.

It is an arithmetic number, because the mean of its divisors is an integer number (23112237).

Almost surely, 2^77040785 is an apocalyptic number.

It is an amenable number.

77040785 is a deficient number, since it is larger than the sum of its proper divisors (15408163).

77040785 is a wasteful number, since it uses less digits than its factorization.

77040785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15408162.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 77040785 is about 8777.2880207955. The cubic root of 77040785 is about 425.5071868796.

The spelling of 77040785 in words is "seventy-seven million, forty thousand, seven hundred eighty-five".