7721073 has 6 divisors (see below), whose sum is σ = 11152674. Its totient is φ = 5147376.

The previous prime is 7721071. The next prime is 7721101. The reversal of 7721073 is 3701277.

It can be written as a sum of positive squares in only one way, i.e., 4524129 + 3196944 = 2127^2 + 1788^2 .

It is not a de Polignac number, because 7721073 - 2¹ = 7721071 is a prime.

It is a super-2 number, since 2×7721073² = 119229936542658, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7721071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 428940 + ... + 428957.

It is an arithmetic number, because the mean of its divisors is an integer number (1858779).

Almost surely, 2^7721073 is an apocalyptic number.

It is an amenable number.

7721073 is a deficient number, since it is larger than the sum of its proper divisors (3431601).

7721073 is a wasteful number, since it uses less digits than its factorization.

7721073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857903 (or 857900 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 7721073 is about 2778.6818817562. The cubic root of 7721073 is about 197.6480586090.

The spelling of 7721073 in words is "seven million, seven hundred twenty-one thousand, seventy-three".