7645644 has 24 divisors (see below), whose sum is σ = 19822320. Its totient is φ = 2548512.

The previous prime is 7645607. The next prime is 7645661. The reversal of 7645644 is 4465467.

7645644 is a `hidden beast` number, since 7 + 6 + 4 + 5 + 644 = 666.

7645644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7645599 and 7645608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35289 + ... + 35504.

It is an arithmetic number, because the mean of its divisors is an integer number (825930).

Almost surely, 2^7645644 is an apocalyptic number.

It is an amenable number.

7645644 is an abundant number, since it is smaller than the sum of its proper divisors (12176676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7645644 is a wasteful number, since it uses less digits than its factorization.

7645644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70806 (or 70798 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 7645644 is about 2765.0757674972. The cubic root of 7645644 is about 197.0023276113.

The spelling of 7645644 in words is "seven million, six hundred forty-five thousand, six hundred forty-four".