128311286 has 8 divisors (see below), whose sum is σ = 192914784. Its totient is φ = 64006360.

The previous prime is 128311259. The next prime is 128311303. The reversal of 128311286 is 682113821.

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

It is a super-2 number, since 2×128311286² = 32927572229947592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73565 + ... + 75288.

It is an arithmetic number, because the mean of its divisors is an integer number (24114348).

Almost surely, 2^128311286 is an apocalyptic number.

128311286 is a deficient number, since it is larger than the sum of its proper divisors (64603498).

128311286 is a wasteful number, since it uses less digits than its factorization.

128311286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149286.

The product of its digits is 4608, while the sum is 32.

The square root of 128311286 is about 11327.4571727286. The cubic root of 128311286 is about 504.3766265027.

The spelling of 128311286 in words is "one hundred twenty-eight million, three hundred eleven thousand, two hundred eighty-six".