308740820 has 18 divisors (see below), whose sum is σ = 648520782. Its totient is φ = 123464896.

The previous prime is 308740819. The next prime is 308740829. The reversal of 308740820 is 28047803.

It can be written as a sum of positive squares in 3 ways, for example, as 1860496 + 306880324 = 1364^2 + 17518^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308740829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76616 + ... + 80544.

Almost surely, 2^308740820 is an apocalyptic number.

It is an amenable number.

308740820 is an abundant number, since it is smaller than the sum of its proper divisors (339779962).

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

308740820 is an frugal number, since it uses more digits than its factorization.

308740820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7867 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 308740820 is about 17571.0221671933. The cubic root of 308740820 is about 675.8723572358.

The spelling of 308740820 in words is "three hundred eight million, seven hundred forty thousand, eight hundred twenty".