308129640 has 384 divisors, whose sum is σ = 1206576000. Its totient is φ = 62318592.

The previous prime is 308129621. The next prime is 308129663. The reversal of 308129640 is 46921803.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2216691 + ... + 2216829.

It is an arithmetic number, because the mean of its divisors is an integer number (3142125).

Almost surely, 2^308129640 is an apocalyptic number.

308129640 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 308129640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603288000).

308129640 is an abundant number, since it is smaller than the sum of its proper divisors (898446360).

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

308129640 is a wasteful number, since it uses less digits than its factorization.

308129640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 308129640 is about 17553.6218484961. The cubic root of 308129640 is about 675.4260794123.

The spelling of 308129640 in words is "three hundred eight million, one hundred twenty-nine thousand, six hundred forty".