128742450 has 48 divisors (see below), whose sum is σ = 320369376. Its totient is φ = 34214400.

The previous prime is 128742433. The next prime is 128742451. The reversal of 128742450 is 54247821.

It is not an unprimeable number, because it can be changed into a prime (128742451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48354 + ... + 50946.

It is an arithmetic number, because the mean of its divisors is an integer number (6674362).

Almost surely, 2^128742450 is an apocalyptic number.

128742450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128742450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160184688).

128742450 is an abundant number, since it is smaller than the sum of its proper divisors (191626926).

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

128742450 is a wasteful number, since it uses less digits than its factorization.

128742450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939 (or 2934 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 128742450 is about 11346.4730202826. The cubic root of 128742450 is about 504.9409465960.

The spelling of 128742450 in words is "one hundred twenty-eight million, seven hundred forty-two thousand, four hundred fifty".