7864649 has 4 divisors (see below), whose sum is σ = 8469636. Its totient is φ = 7259664.

The previous prime is 7864639. The next prime is 7864673. The reversal of 7864649 is 9464687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 868624 + 6996025 = 932^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 7864649 - 2¹² = 7860553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7864639) 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, 302474 + ... + 302499.

It is an arithmetic number, because the mean of its divisors is an integer number (2117409).

Almost surely, 2^7864649 is an apocalyptic number.

It is an amenable number.

7864649 is a deficient number, since it is larger than the sum of its proper divisors (604987).

7864649 is a wasteful number, since it uses less digits than its factorization.

7864649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604986.

The product of its digits is 290304, while the sum is 44.

The square root of 7864649 is about 2804.3981529020. The cubic root of 7864649 is about 198.8656534530.

The spelling of 7864649 in words is "seven million, eight hundred sixty-four thousand, six hundred forty-nine".