7720691 has 4 divisors (see below), whose sum is σ = 8422584. Its totient is φ = 7018800.

The previous prime is 7720673. The next prime is 7720697. The reversal of 7720691 is 1960277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1960277 = 11 ⋅178207.

It is a cyclic number.

It is not a de Polignac number, because 7720691 - 2¹⁰ = 7719667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720697) 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, 350930 + ... + 350951.

It is an arithmetic number, because the mean of its divisors is an integer number (2105646).

Almost surely, 2^7720691 is an apocalyptic number.

7720691 is a deficient number, since it is larger than the sum of its proper divisors (701893).

7720691 is a wasteful number, since it uses less digits than its factorization.

7720691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701892.

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

The square root of 7720691 is about 2778.6131432785. The cubic root of 7720691 is about 197.6447990101.

The spelling of 7720691 in words is "seven million, seven hundred twenty thousand, six hundred ninety-one".