128851990 has 16 divisors (see below), whose sum is σ = 232269120. Its totient is φ = 51466240.

The previous prime is 128851969. The next prime is 128851997. The reversal of 128851990 is 99158821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128851997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1771 + ... + 16150.

It is an arithmetic number, because the mean of its divisors is an integer number (14516820).

Almost surely, 2^128851990 is an apocalyptic number.

128851990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128851990 is a deficient number, since it is larger than the sum of its proper divisors (103417130).

128851990 is a wasteful number, since it uses less digits than its factorization.

128851990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18647.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 128851990 is about 11351.2990446028. The cubic root of 128851990 is about 505.0841149956.

The spelling of 128851990 in words is "one hundred twenty-eight million, eight hundred fifty-one thousand, nine hundred ninety".