308290640 has 40 divisors (see below), whose sum is σ = 819173760. Its totient is φ = 105699456.

The previous prime is 308290589. The next prime is 308290649. The reversal of 308290640 is 46092803.

308290640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 308290597 and 308290606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308290649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274700 + ... + 275819.

It is an arithmetic number, because the mean of its divisors is an integer number (20479344).

Almost surely, 2^308290640 is an apocalyptic number.

It is an amenable number.

308290640 is an abundant number, since it is smaller than the sum of its proper divisors (510883120).

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

308290640 is a wasteful number, since it uses less digits than its factorization.

308290640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550539 (or 550533 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 308290640 is about 17558.2071977751. The cubic root of 308290640 is about 675.5436972917.

The spelling of 308290640 in words is "three hundred eight million, two hundred ninety thousand, six hundred forty".