308477920 has 192 divisors, whose sum is σ = 836075520. Its totient is φ = 106831872.

The previous prime is 308477899. The next prime is 308477929. The reversal of 308477920 is 29774803.

308477920 = 6² + 7² + ... + 974².

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308477929) 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, 2428897 + ... + 2429023.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560).

Almost surely, 2^308477920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308477920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418037760).

308477920 is an abundant number, since it is smaller than the sum of its proper divisors (527597600).

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

308477920 is a wasteful number, since it uses less digits than its factorization.

308477920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 308477920 is about 17563.5395066029. The cubic root of 308477920 is about 675.6804624059.

The spelling of 308477920 in words is "three hundred eight million, four hundred seventy-seven thousand, nine hundred twenty".