128766390 has 16 divisors (see below), whose sum is σ = 309039408. Its totient is φ = 34337696.

The previous prime is 128766389. The next prime is 128766413. The reversal of 128766390 is 93667821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146077 + ... + 2146136.

It is an arithmetic number, because the mean of its divisors is an integer number (19314963).

Almost surely, 2^128766390 is an apocalyptic number.

128766390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128766390 is an abundant number, since it is smaller than the sum of its proper divisors (180273018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128766390 is a wasteful number, since it uses less digits than its factorization.

128766390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4292223.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 128766390 is about 11347.5279246186. The cubic root of 128766390 is about 504.9722430256.

The spelling of 128766390 in words is "one hundred twenty-eight million, seven hundred sixty-six thousand, three hundred ninety".