128265490 has 8 divisors (see below), whose sum is σ = 230877900. Its totient is φ = 51306192.

The previous prime is 128265451. The next prime is 128265559. The reversal of 128265490 is 94562821.

It can be written as a sum of positive squares in 2 ways, for example, as 126945289 + 1320201 = 11267^2 + 1149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6413265 + ... + 6413284.

Almost surely, 2^128265490 is an apocalyptic number.

128265490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128265490 is a deficient number, since it is larger than the sum of its proper divisors (102612410).

128265490 is a wasteful number, since it uses less digits than its factorization.

128265490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12826556.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 128265490 is about 11325.4355324641. The cubic root of 128265490 is about 504.3166131261.

The spelling of 128265490 in words is "one hundred twenty-eight million, two hundred sixty-five thousand, four hundred ninety".