7821064 has 16 divisors (see below), whose sum is σ = 14709420. Its totient is φ = 3898560.

The previous prime is 7821059. The next prime is 7821067. The reversal of 7821064 is 4601287.

It can be written as a sum of positive squares in 2 ways, for example, as 7518564 + 302500 = 2742^2 + 550^2 .

It is a super-2 number, since 2×7821064² = 122338084184192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7821067) 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, 1674 + ... + 4294.

Almost surely, 2^7821064 is an apocalyptic number.

It is an amenable number.

7821064 is a deficient number, since it is larger than the sum of its proper divisors (6888356).

7821064 is a wasteful number, since it uses less digits than its factorization.

7821064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000 (or 2996 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 7821064 is about 2796.6165271628. The cubic root of 7821064 is about 198.4976090333.

The spelling of 7821064 in words is "seven million, eight hundred twenty-one thousand, sixty-four".