128420340 has 48 divisors (see below), whose sum is σ = 369301632. Its totient is φ = 33319296.

The previous prime is 128420291. The next prime is 128420393. The reversal of 128420340 is 43024821.

It is a self number, because there is not a number n which added to its sum of digits gives 128420340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26704 + ... + 31143.

It is an arithmetic number, because the mean of its divisors is an integer number (7693784).

Almost surely, 2^128420340 is an apocalyptic number.

128420340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128420340 is an abundant number, since it is smaller than the sum of its proper divisors (240881292).

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

128420340 is a wasteful number, since it uses less digits than its factorization.

128420340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57896 (or 57894 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 128420340 is about 11332.2698520641. The cubic root of 128420340 is about 504.5194788702.

The spelling of 128420340 in words is "one hundred twenty-eight million, four hundred twenty thousand, three hundred forty".