89781620 has 12 divisors (see below), whose sum is σ = 188541444. Its totient is φ = 35912640.

The previous prime is 89781619. The next prime is 89781649. The reversal of 89781620 is 2618798.

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 72658576 = 4138^2 + 8524^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244521 + ... + 2244560.

It is an arithmetic number, because the mean of its divisors is an integer number (15711787).

Almost surely, 2^89781620 is an apocalyptic number.

It is an amenable number.

89781620 is an abundant number, since it is smaller than the sum of its proper divisors (98759824).

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

89781620 is a wasteful number, since it uses less digits than its factorization.

89781620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489090 (or 4489088 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 89781620 is about 9475.3163535578. The cubic root of 89781620 is about 447.7777184397. Note that the first 4 decimals are identical.

The spelling of 89781620 in words is "eighty-nine million, seven hundred eighty-one thousand, six hundred twenty".