305720 has 16 divisors (see below), whose sum is σ = 687960. Its totient is φ = 122272.

The previous prime is 305719. The next prime is 305741. The reversal of 305720 is 27503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3782 + ... + 3861.

2³⁰⁵⁷²⁰ is an apocalyptic number.

It is an amenable number.

305720 is an abundant number, since it is smaller than the sum of its proper divisors (382240).

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

305720 is a wasteful number, since it uses less digits than its factorization.

305720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654 (or 7650 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 305720 is about 552.9195239816. The cubic root of 305720 is about 67.3660810762.

The spelling of 305720 in words is "three hundred five thousand, seven hundred twenty".