128867408 has 20 divisors (see below), whose sum is σ = 251650560. Its totient is φ = 63925344.

The previous prime is 128867399. The next prime is 128867419. The reversal of 128867408 is 804768821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29678 + ... + 33741.

It is an arithmetic number, because the mean of its divisors is an integer number (12582528).

Almost surely, 2^128867408 is an apocalyptic number.

It is an amenable number.

128867408 is a deficient number, since it is larger than the sum of its proper divisors (122783152).

128867408 is a wasteful number, since it uses less digits than its factorization.

128867408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63554 (or 63548 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 128867408 is about 11351.9781536083. The cubic root of 128867408 is about 505.1042597532.

The spelling of 128867408 in words is "one hundred twenty-eight million, eight hundred sixty-seven thousand, four hundred eight".