128161742 has 16 divisors (see below), whose sum is σ = 203841360. Its totient is φ = 60225408.

The previous prime is 128161739. The next prime is 128161757. The reversal of 128161742 is 247161821.

It is a happy number.

It is a super-2 number, since 2×128161742² = 32850864224949128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128161699 and 128161708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25913 + ... + 30459.

It is an arithmetic number, because the mean of its divisors is an integer number (12740085).

Almost surely, 2^128161742 is an apocalyptic number.

128161742 is a deficient number, since it is larger than the sum of its proper divisors (75679618).

128161742 is a wasteful number, since it uses less digits than its factorization.

128161742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395.

The product of its digits is 5376, while the sum is 32.

The square root of 128161742 is about 11320.8542963859. The cubic root of 128161742 is about 504.1806036840.

The spelling of 128161742 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, seven hundred forty-two".