7289864 has 8 divisors (see below), whose sum is σ = 13668510. Its totient is φ = 3644928.

The previous prime is 7289861. The next prime is 7289911. The reversal of 7289864 is 4689827.

It can be written as a sum of positive squares in only one way, i.e., 6461764 + 828100 = 2542^2 + 910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7289861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455609 + ... + 455624.

Almost surely, 2^7289864 is an apocalyptic number.

It is an amenable number.

7289864 is a deficient number, since it is larger than the sum of its proper divisors (6378646).

7289864 is a wasteful number, since it uses less digits than its factorization.

7289864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911239 (or 911235 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 7289864 is about 2699.9748146974. The cubic root of 7289864 is about 193.8979163212.

The spelling of 7289864 in words is "seven million, two hundred eighty-nine thousand, eight hundred sixty-four".