308890920 has 128 divisors (see below), whose sum is σ = 1041465600. Its totient is φ = 72720384.

The previous prime is 308890889. The next prime is 308890921. The reversal of 308890920 is 29098803.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (308890921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31576 + ... + 40184.

It is an arithmetic number, because the mean of its divisors is an integer number (8136450).

Almost surely, 2^308890920 is an apocalyptic number.

308890920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308890920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (520732800).

308890920 is an abundant number, since it is smaller than the sum of its proper divisors (732574680).

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

308890920 is a wasteful number, since it uses less digits than its factorization.

308890920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8659 (or 8655 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 308890920 is about 17575.2928851840. The cubic root of 308890920 is about 675.9818687293.

The spelling of 308890920 in words is "three hundred eight million, eight hundred ninety thousand, nine hundred twenty".