7689360721 has 9 divisors (see below), whose sum is σ = 8945480649. Its totient is φ = 6590354484.

The previous prime is 7689360647. The next prime is 7689360733. The reversal of 7689360721 is 1270639867.

It is a happy number.

The square root of 7689360721 is 87689.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 7689360721 - 2¹¹ = 7689358673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (7689360761) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 607560 + ... + 620086.

Almost surely, 2^7689360721 is an apocalyptic number.

7689360721 is the 87689-th square number.

7689360721 is the 43845-th centered octagonal number.

It is an amenable number.

7689360721 is a deficient number, since it is larger than the sum of its proper divisors (1256119928).

7689360721 is an frugal number, since it uses more digits than its factorization.

7689360721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25068 (or 12534 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 49.

The cubic root of 7689360721 is about 1973.7709146826.

Multiplying 7689360721 by its sum of digits (49), we get a square (376778675329 = 613823²).

7689360721 divided by its sum of digits (49) gives a square (156925729 = 12527²).

The spelling of 7689360721 in words is "seven billion, six hundred eighty-nine million, three hundred sixty thousand, seven hundred twenty-one".