128742936 has 128 divisors (see below), whose sum is σ = 395020800. Its totient is φ = 34145280.

The previous prime is 128742931. The next prime is 128742949. The reversal of 128742936 is 639247821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128742931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168796 + ... + 169556.

It is an arithmetic number, because the mean of its divisors is an integer number (3086100).

Almost surely, 2^128742936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128742936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197510400).

128742936 is an abundant number, since it is smaller than the sum of its proper divisors (266277864).

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

128742936 is a wasteful number, since it uses less digits than its factorization.

128742936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 845 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 128742936 is about 11346.4944366090. The cubic root of 128742936 is about 504.9415819756.

The spelling of 128742936 in words is "one hundred twenty-eight million, seven hundred forty-two thousand, nine hundred thirty-six".