4306640 has 80 divisors (see below), whose sum is σ = 11155536. Its totient is φ = 1536000.

The previous prime is 4306639. The next prime is 4306651. The reversal of 4306640 is 466034.

It can be written as a sum of positive squares in 8 ways, for example, as 274576 + 4032064 = 524^2 + 2008^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42590 + ... + 42690.

Almost surely, 2^4306640 is an apocalyptic number.

4306640 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 4306640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5577768).

4306640 is an abundant number, since it is smaller than the sum of its proper divisors (6848896).

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

4306640 is a wasteful number, since it uses less digits than its factorization.

4306640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 4306640 is about 2075.2445639008. The cubic root of 4306640 is about 162.6969918678.

Subtracting from 4306640 its reverse (466034), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 4306640 in words is "four million, three hundred six thousand, six hundred forty".