928449800721 has 9 divisors (see below), whose sum is σ = 1341098332041. Its totient is φ = 618964606692.

The previous prime is 928449800699. The next prime is 928449800777. The reversal of 928449800721 is 127008944829.

The square root of 928449800721 is 963561.

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

928449800721 is a `hidden beast` number, since 9 + 2 + 84 + 498 + 0 + 0 + 72 + 1 = 666.

928449800721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 928449800721 - 2⁵ = 928449800689 is a prime.

It is a super-2 number, since 2×928449800721² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (928449800821) 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, 2730090 + ... + 3051276.

Almost surely, 2^928449800721 is an apocalyptic number.

928449800721 is the 963561-st square number.

928449800721 is the 481781-st centered octagonal number.

It is an amenable number.

928449800721 is a deficient number, since it is larger than the sum of its proper divisors (412648531320).

928449800721 is an frugal number, since it uses more digits than its factorization.

928449800721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642380 (or 321190 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 928449800721 in words is "nine hundred twenty-eight billion, four hundred forty-nine million, eight hundred thousand, seven hundred twenty-one".