7720901 has 4 divisors (see below), whose sum is σ = 7929612. Its totient is φ = 7512192.

The previous prime is 7720877. The next prime is 7720903. The reversal of 7720901 is 1090277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1090277 = 19 ⋅57383.

It can be written as a sum of positive squares in 2 ways, for example, as 3724900 + 3996001 = 1930^2 + 1999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7720901 is a prime.

It is a super-4 number, since 4×7720901⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720903) 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, 104300 + ... + 104373.

It is an arithmetic number, because the mean of its divisors is an integer number (1982403).

Almost surely, 2^7720901 is an apocalyptic number.

It is an amenable number.

7720901 is a deficient number, since it is larger than the sum of its proper divisors (208711).

7720901 is a wasteful number, since it uses less digits than its factorization.

7720901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208710.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 7720901 is about 2778.6509316573. The cubic root of 7720901 is about 197.6465909495.

The spelling of 7720901 in words is "seven million, seven hundred twenty thousand, nine hundred one".