128378890 has 12 divisors (see below), whose sum is σ = 231146514. Its totient is φ = 51337224.

The previous prime is 128378881. The next prime is 128378897. The reversal of 128378890 is 98873821.

It can be written as a sum of positive squares in only one way, i.e., 115541001 + 12837889 = 10749^2 + 3583^2 .

It is a super-2 number, since 2×128378890² = 32962278795264200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128378890.

It is not an unprimeable number, because it can be changed into a prime (128378897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34039 + ... + 37621.

Almost surely, 2^128378890 is an apocalyptic number.

128378890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128378890 is a deficient number, since it is larger than the sum of its proper divisors (102767624).

128378890 is an frugal number, since it uses more digits than its factorization.

128378890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7173 (or 3590 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 128378890 is about 11330.4408563833. The cubic root of 128378890 is about 504.4651920837.

The spelling of 128378890 in words is "one hundred twenty-eight million, three hundred seventy-eight thousand, eight hundred ninety".