308897640 has 192 divisors, whose sum is σ = 1051315200. Its totient is φ = 78566400.

The previous prime is 308897581. The next prime is 308897651. The reversal of 308897640 is 46798803.

It is a happy number.

308897640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 993085 + ... + 993395.

It is an arithmetic number, because the mean of its divisors is an integer number (5475600).

Almost surely, 2^308897640 is an apocalyptic number.

308897640 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 308897640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (525657600).

308897640 is an abundant number, since it is smaller than the sum of its proper divisors (742417560).

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

308897640 is a wasteful number, since it uses less digits than its factorization.

308897640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 308897640 is about 17575.4840616126. The cubic root of 308897640 is about 675.9867707459.

The spelling of 308897640 in words is "three hundred eight million, eight hundred ninety-seven thousand, six hundred forty".