7812645 has 16 divisors (see below), whose sum is σ = 12534912. Its totient is φ = 4155200.

The previous prime is 7812613. The next prime is 7812647. The reversal of 7812645 is 5462187.

It is not a de Polignac number, because 7812645 - 2⁵ = 7812613 is a prime.

It is a super-2 number, since 2×7812645² = 122074843792050, which contains 22 as substring.

7812645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7812647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10144 + ... + 10886.

It is an arithmetic number, because the mean of its divisors is an integer number (783432).

Almost surely, 2^7812645 is an apocalyptic number.

It is an amenable number.

7812645 is a deficient number, since it is larger than the sum of its proper divisors (4722267).

7812645 is a wasteful number, since it uses less digits than its factorization.

7812645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452.

The product of its digits is 13440, while the sum is 33.

The square root of 7812645 is about 2795.1109101429. The cubic root of 7812645 is about 198.4263590786.

It can be divided in two parts, 78 and 12645, that multiplied together give a triangular number (986310 = T₁₄₀₄).

The spelling of 7812645 in words is "seven million, eight hundred twelve thousand, six hundred forty-five".