305690 has 32 divisors (see below), whose sum is σ = 687744. Its totient is φ = 95040.

The previous prime is 305663. The next prime is 305717. The reversal of 305690 is 96503.

It is an interprime number because it is at equal distance from previous prime (305663) and next prime (305717).

It is a super-2 number, since 2×305690² = 186892752200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572 + ... + 968.

It is an arithmetic number, because the mean of its divisors is an integer number (21492).

2³⁰⁵⁶⁹⁰ is an apocalyptic number.

305690 is an abundant number, since it is smaller than the sum of its proper divisors (382054).

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

305690 is a wasteful number, since it uses less digits than its factorization.

305690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 305690 is about 552.8923945941. The cubic root of 305690 is about 67.3638774819.

The spelling of 305690 in words is "three hundred five thousand, six hundred ninety".