308018820 has 48 divisors (see below), whose sum is σ = 863311680. Its totient is φ = 82056576.

The previous prime is 308018819. The next prime is 308018827. The reversal of 308018820 is 28810803.

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

It is not an unprimeable number, because it can be changed into a prime (308018827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80511 + ... + 84249.

It is an arithmetic number, because the mean of its divisors is an integer number (17985660).

Almost surely, 2^308018820 is an apocalyptic number.

308018820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

308018820 is an abundant number, since it is smaller than the sum of its proper divisors (555292860).

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

308018820 is a wasteful number, since it uses less digits than its factorization.

308018820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124 (or 5122 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 308018820 is about 17550.4649511060. The cubic root of 308018820 is about 675.3450965146.

It can be divided in two parts, 30801 and 8820, that added together give a triangular number (39621 = T₂₈₁).

The spelling of 308018820 in words is "three hundred eight million, eighteen thousand, eight hundred twenty".