7720961 has 4 divisors (see below), whose sum is σ = 7729152. Its totient is φ = 7712772.

The previous prime is 7720957. The next prime is 7720967. The reversal of 7720961 is 1690277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7720961 - 2² = 7720957 is a prime.

It is a super-2 number, since 2×7720961² = 119226477527042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720967) 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, 2465 + ... + 4638.

It is an arithmetic number, because the mean of its divisors is an integer number (1932288).

It is a Proth number, since it is equal to 1885 ⋅ 2¹² + 1 and 1885 < 2¹².

Almost surely, 2^7720961 is an apocalyptic number.

It is an amenable number.

7720961 is a deficient number, since it is larger than the sum of its proper divisors (8191).

7720961 is a wasteful number, since it uses less digits than its factorization.

7720961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 7720961 is about 2778.6617282426. The cubic root of 7720961 is about 197.6471029262.

The spelling of 7720961 in words is "seven million, seven hundred twenty thousand, nine hundred sixty-one".