128252290 has 8 divisors (see below), whose sum is σ = 230854140. Its totient is φ = 51300912.

The previous prime is 128252281. The next prime is 128252291. The reversal of 128252290 is 92252821.

It can be written as a sum of positive squares in 2 ways, for example, as 109181601 + 19070689 = 10449^2 + 4367^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128252291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6412605 + ... + 6412624.

Almost surely, 2^128252290 is an apocalyptic number.

128252290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128252290 is a deficient number, since it is larger than the sum of its proper divisors (102601850).

128252290 is a wasteful number, since it uses less digits than its factorization.

128252290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12825236.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 128252290 is about 11324.8527584247. The cubic root of 128252290 is about 504.2993125317.

The spelling of 128252290 in words is "one hundred twenty-eight million, two hundred fifty-two thousand, two hundred ninety".