89445720 has 128 divisors (see below), whose sum is σ = 330301440. Its totient is φ = 18869760.

The previous prime is 89445679. The next prime is 89445731. The reversal of 89445720 is 2754498.

89445720 = T₃₀₇ + T₃₀₈ + ... + T₈₂₆.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6825 + ... + 15015.

It is an arithmetic number, because the mean of its divisors is an integer number (2580480).

Almost surely, 2^89445720 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 89445720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165150720).

89445720 is an abundant number, since it is smaller than the sum of its proper divisors (240855720).

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

89445720 is a wasteful number, since it uses less digits than its factorization.

89445720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8225 (or 8221 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 89445720 is about 9457.5747419727. The cubic root of 89445720 is about 447.2185969440.

The spelling of 89445720 in words is "eighty-nine million, four hundred forty-five thousand, seven hundred twenty".