43551620 has 96 divisors (see below), whose sum is σ = 114670080. Its totient is φ = 13547520.

The previous prime is 43551601. The next prime is 43551659. The reversal of 43551620 is 2615534.

It is a self number, because there is not a number n which added to its sum of digits gives 43551620.

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, 68705 + ... + 69335.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^43551620 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 43551620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57335040).

43551620 is an abundant number, since it is smaller than the sum of its proper divisors (71118460).

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

43551620 is a wasteful number, since it uses less digits than its factorization.

43551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 43551620 is about 6599.3651209794. The cubic root of 43551620 is about 351.8315417243.

The spelling of 43551620 in words is "forty-three million, five hundred fifty-one thousand, six hundred twenty".