128121862 has 16 divisors (see below), whose sum is σ = 212528592. Its totient is φ = 57438720.

The previous prime is 128121821. The next prime is 128121869. The reversal of 128121862 is 268121821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128121869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38283 + ... + 41494.

It is an arithmetic number, because the mean of its divisors is an integer number (13283037).

Almost surely, 2^128121862 is an apocalyptic number.

128121862 is a deficient number, since it is larger than the sum of its proper divisors (84406730).

128121862 is a wasteful number, since it uses less digits than its factorization.

128121862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79863.

The product of its digits is 3072, while the sum is 31.

The square root of 128121862 is about 11319.0928081715. The cubic root of 128121862 is about 504.1283030830.

The spelling of 128121862 in words is "one hundred twenty-eight million, one hundred twenty-one thousand, eight hundred sixty-two".