307968640 has 64 divisors (see below), whose sum is σ = 841426560. Its totient is φ = 105587712.

The previous prime is 307968631. The next prime is 307968641. The reversal of 307968640 is 46869703.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (307968641) 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, 29892 + ... + 38851.

It is an arithmetic number, because the mean of its divisors is an integer number (13147290).

Almost surely, 2^307968640 is an apocalyptic number.

It is an amenable number.

307968640 is an abundant number, since it is smaller than the sum of its proper divisors (533457920).

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

307968640 is an equidigital number, since it uses as much as digits as its factorization.

307968640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68769 (or 68757 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 307968640 is about 17549.0353011213. The cubic root of 307968640 is about 675.3084205550.

The spelling of 307968640 in words is "three hundred seven million, nine hundred sixty-eight thousand, six hundred forty".