309481680 has 80 divisors (see below), whose sum is σ = 990365184. Its totient is φ = 79864320.

The previous prime is 309481673. The next prime is 309481691. The reversal of 309481680 is 86184903.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13359 + ... + 28238.

Almost surely, 2^309481680 is an apocalyptic number.

309481680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309481680 is an abundant number, since it is smaller than the sum of its proper divisors (680883504).

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

309481680 is a wasteful number, since it uses less digits than its factorization.

309481680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41644 (or 41638 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 309481680 is about 17592.0914049467. The cubic root of 309481680 is about 676.4125371943.

The spelling of 309481680 in words is "three hundred nine million, four hundred eighty-one thousand, six hundred eighty".