7721316 has 18 divisors (see below), whose sum is σ = 19517862. Its totient is φ = 2573760.

The previous prime is 7721303. The next prime is 7721339. The reversal of 7721316 is 6131277.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 1218816 = 2550^2 + 1104^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 7721316.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107205 + ... + 107276.

Almost surely, 2^7721316 is an apocalyptic number.

It is an amenable number.

7721316 is an abundant number, since it is smaller than the sum of its proper divisors (11796546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7721316 is a wasteful number, since it uses less digits than its factorization.

7721316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214491 (or 214486 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 7721316 is about 2778.7256071804. The cubic root of 7721316 is about 197.6501320676.

The spelling of 7721316 in words is "seven million, seven hundred twenty-one thousand, three hundred sixteen".