305745820 has 24 divisors (see below), whose sum is σ = 642396384. Its totient is φ = 122235456.

The previous prime is 305745757. The next prime is 305745821. The reversal of 305745820 is 28547503.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305745821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68497 + ... + 72823.

It is an arithmetic number, because the mean of its divisors is an integer number (26766516).

Almost surely, 2^305745820 is an apocalyptic number.

It is an amenable number.

305745820 is an abundant number, since it is smaller than the sum of its proper divisors (336650564).

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

305745820 is a wasteful number, since it uses less digits than its factorization.

305745820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7869 (or 7867 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 305745820 is about 17485.5889234535. The cubic root of 305745820 is about 673.6797752094.

The spelling of 305745820 in words is "three hundred five million, seven hundred forty-five thousand, eight hundred twenty".