305445630 has 128 divisors (see below), whose sum is σ = 901020672. Its totient is φ = 64677888.

The previous prime is 305445617. The next prime is 305445631. The reversal of 305445630 is 36544503.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305445631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238552 + ... + 239828.

It is an arithmetic number, because the mean of its divisors is an integer number (7039224).

Almost surely, 2^305445630 is an apocalyptic number.

305445630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 305445630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (450510336).

305445630 is an abundant number, since it is smaller than the sum of its proper divisors (595575042).

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

305445630 is a wasteful number, since it uses less digits than its factorization.

305445630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 305445630 is about 17477.0028895117. The cubic root of 305445630 is about 673.4592236484.

It can be divided in two parts, 3054 and 45630, that added together give a palindrome (48684).

The spelling of 305445630 in words is "three hundred five million, four hundred forty-five thousand, six hundred thirty".