4356640 has 48 divisors (see below), whose sum is σ = 10461528. Its totient is φ = 1714176.

The previous prime is 4356563. The next prime is 4356661. The reversal of 4356640 is 466534.

It can be written as a sum of positive squares in 4 ways, for example, as 3671056 + 685584 = 1916^2 + 828^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4356599 and 4356608.

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, 11494 + ... + 11866.

Almost surely, 2^4356640 is an apocalyptic number.

4356640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4356640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5230764).

4356640 is an abundant number, since it is smaller than the sum of its proper divisors (6104888).

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

4356640 is a wasteful number, since it uses less digits than its factorization.

4356640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 4356640 is about 2087.2565726331. The cubic root of 4356640 is about 163.3242069962.

The spelling of 4356640 in words is "four million, three hundred fifty-six thousand, six hundred forty".