128157550 has 12 divisors (see below), whose sum is σ = 238373136. Its totient is φ = 51263000.

The previous prime is 128157517. The next prime is 128157563. The reversal of 128157550 is 55751821.

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, 1281526 + ... + 1281625.

It is an arithmetic number, because the mean of its divisors is an integer number (19864428).

Almost surely, 2^128157550 is an apocalyptic number.

128157550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128157550 is a deficient number, since it is larger than the sum of its proper divisors (110215586).

128157550 is a wasteful number, since it uses less digits than its factorization.

128157550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563163 (or 2563158 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 34.

The square root of 128157550 is about 11320.6691498339. The cubic root of 128157550 is about 504.1751065985.

The spelling of 128157550 in words is "one hundred twenty-eight million, one hundred fifty-seven thousand, five hundred fifty".