7780001 has 4 divisors (see below), whose sum is σ = 7907604. Its totient is φ = 7652400.

The previous prime is 7779997. The next prime is 7780007. The reversal of 7780001 is 1000877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000877 = 29 ⋅34513.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 4734976 = 1745^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 7780001 - 2² = 7779997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7780007) 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, 63710 + ... + 63831.

It is an arithmetic number, because the mean of its divisors is an integer number (1976901).

Almost surely, 2^7780001 is an apocalyptic number.

It is an amenable number.

7780001 is a deficient number, since it is larger than the sum of its proper divisors (127603).

7780001 is a wasteful number, since it uses less digits than its factorization.

7780001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127602.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 7780001 is about 2789.2653154549. The cubic root of 7780001 is about 198.1496080452.

Adding to 7780001 its reverse (1000877), we get a palindrome (8780878).

The spelling of 7780001 in words is "seven million, seven hundred eighty thousand, one".