305307640 has 32 divisors (see below), whose sum is σ = 749392560. Its totient is φ = 111020800.

The previous prime is 305307631. The next prime is 305307703. The reversal of 305307640 is 46703503.

It is a junction number, because it is equal to n+sod(n) for n = 305307599 and 305307608.

It is a congruent number.

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, 346501 + ... + 347380.

Almost surely, 2^305307640 is an apocalyptic number.

It is an amenable number.

305307640 is an abundant number, since it is smaller than the sum of its proper divisors (444084920).

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

305307640 is a wasteful number, since it uses less digits than its factorization.

305307640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693903 (or 693899 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 305307640 is about 17473.0546842846. The cubic root of 305307640 is about 673.3577930097.

The spelling of 305307640 in words is "three hundred five million, three hundred seven thousand, six hundred forty".