128122550 has 12 divisors (see below), whose sum is σ = 238308036. Its totient is φ = 51249000.

The previous prime is 128122543. The next prime is 128122583. The reversal of 128122550 is 55221821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1281176 + ... + 1281275.

It is an arithmetic number, because the mean of its divisors is an integer number (19859003).

Almost surely, 2^128122550 is an apocalyptic number.

128122550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128122550 is a deficient number, since it is larger than the sum of its proper divisors (110185486).

128122550 is a wasteful number, since it uses less digits than its factorization.

128122550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562463 (or 2562458 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 128122550 is about 11319.1231992589. The cubic root of 128122550 is about 504.1292054522.

The spelling of 128122550 in words is "one hundred twenty-eight million, one hundred twenty-two thousand, five hundred fifty".