7780085 has 4 divisors (see below), whose sum is σ = 9336108. Its totient is φ = 6224064.

The previous prime is 7780081. The next prime is 7780117. The reversal of 7780085 is 5800877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5800877 = 1619 ⋅3583.

It can be written as a sum of positive squares in 2 ways, for example, as 1540081 + 6240004 = 1241^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 7780085 - 2² = 7780081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778004 + ... + 778013.

It is an arithmetic number, because the mean of its divisors is an integer number (2334027).

Almost surely, 2^7780085 is an apocalyptic number.

It is an amenable number.

7780085 is a deficient number, since it is larger than the sum of its proper divisors (1556023).

7780085 is a wasteful number, since it uses less digits than its factorization.

7780085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556022.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 7780085 is about 2789.2803731429. The cubic root of 7780085 is about 198.1503211773.

The spelling of 7780085 in words is "seven million, seven hundred eighty thousand, eighty-five".