7720261 has 8 divisors (see below), whose sum is σ = 8287704. Its totient is φ = 7165440.

The previous prime is 7720247. The next prime is 7720283. The reversal of 7720261 is 1620277.

It can be written as a sum of positive squares in 4 ways, for example, as 591361 + 7128900 = 769^2 + 2670^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7720261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720201) 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 7 ways as a sum of consecutive naturals, for example, 1870 + ... + 4351.

It is an arithmetic number, because the mean of its divisors is an integer number (1035963).

Almost surely, 2^7720261 is an apocalyptic number.

It is an amenable number.

7720261 is a deficient number, since it is larger than the sum of its proper divisors (567443).

7720261 is a wasteful number, since it uses less digits than its factorization.

7720261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6311.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 7720261 is about 2778.5357654707. The cubic root of 7720261 is about 197.6411296994.

The spelling of 7720261 in words is "seven million, seven hundred twenty thousand, two hundred sixty-one".