7728961 has 4 divisors (see below), whose sum is σ = 7768000. Its totient is φ = 7689924.

The previous prime is 7728923. The next prime is 7728983. The reversal of 7728961 is 1698277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7728961 - 2¹¹ = 7726913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7728361) 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, 19221 + ... + 19618.

It is an arithmetic number, because the mean of its divisors is an integer number (1942000).

Almost surely, 2^7728961 is an apocalyptic number.

It is an amenable number.

7728961 is a deficient number, since it is larger than the sum of its proper divisors (39039).

7728961 is a wasteful number, since it uses less digits than its factorization.

7728961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39038.

The product of its digits is 42336, while the sum is 40.

The square root of 7728961 is about 2780.1008974496. The cubic root of 7728961 is about 197.7153427490.

The spelling of 7728961 in words is "seven million, seven hundred twenty-eight thousand, nine hundred sixty-one".