7780065 has 16 divisors (see below), whose sum is σ = 12484800. Its totient is φ = 4137152.

The previous prime is 7780061. The next prime is 7780081. The reversal of 7780065 is 5600877.

It is not a de Polignac number, because 7780065 - 2² = 7780061 is a prime.

It is a super-2 number, since 2×7780065² = 121058822808450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

7780065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7780061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7126 + ... + 8144.

It is an arithmetic number, because the mean of its divisors is an integer number (780300).

Almost surely, 2^7780065 is an apocalyptic number.

It is an amenable number.

7780065 is a deficient number, since it is larger than the sum of its proper divisors (4704735).

7780065 is a wasteful number, since it uses less digits than its factorization.

7780065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 7780065 is about 2789.2767879864. The cubic root of 7780065 is about 198.1501513844.

The spelling of 7780065 in words is "seven million, seven hundred eighty thousand, sixty-five".