43128720 has 160 divisors (see below), whose sum is σ = 152490240. Its totient is φ = 11197440.

The previous prime is 43128671. The next prime is 43128731. The reversal of 43128720 is 2782134.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88317 + ... + 88803.

It is an arithmetic number, because the mean of its divisors is an integer number (953064).

Almost surely, 2^43128720 is an apocalyptic number.

43128720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43128720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76245120).

43128720 is an abundant number, since it is smaller than the sum of its proper divisors (109361520).

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

43128720 is a wasteful number, since it uses less digits than its factorization.

43128720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 43128720 is about 6567.2459981335. The cubic root of 43128720 is about 350.6890371756.

The spelling of 43128720 in words is "forty-three million, one hundred twenty-eight thousand, seven hundred twenty".