128672550 has 60 divisors (see below), whose sum is σ = 357530316. Its totient is φ = 34311600.

The previous prime is 128672549. The next prime is 128672567. The reversal of 128672550 is 55276821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 11836 + ... + 19935.

Almost surely, 2^128672550 is an apocalyptic number.

128672550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128672550 is an abundant number, since it is smaller than the sum of its proper divisors (228857766).

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

128672550 is a wasteful number, since it uses less digits than its factorization.

128672550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31795 (or 31781 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 128672550 is about 11343.3923497338. The cubic root of 128672550 is about 504.8495450888.

The spelling of 128672550 in words is "one hundred twenty-eight million, six hundred seventy-two thousand, five hundred fifty".