7780216 has 16 divisors (see below), whose sum is σ = 14666400. Its totient is φ = 3869184.

The previous prime is 7780193. The next prime is 7780217. The reversal of 7780216 is 6120877.

It is a happy number.

It is a super-2 number, since 2×7780216² = 121063522013312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780217) 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, 976 + ... + 4063.

It is an arithmetic number, because the mean of its divisors is an integer number (916650).

Almost surely, 2^7780216 is an apocalyptic number.

It is an amenable number.

7780216 is a deficient number, since it is larger than the sum of its proper divisors (6886184).

7780216 is a wasteful number, since it uses less digits than its factorization.

7780216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238 (or 5234 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 7780216 is about 2789.3038558035. The cubic root of 7780216 is about 198.1514333137.

The spelling of 7780216 in words is "seven million, seven hundred eighty thousand, two hundred sixteen".