66089520 has 400 divisors, whose sum is σ = 276553728. Its totient is φ = 14307840.

The previous prime is 66089503. The next prime is 66089561. The reversal of 66089520 is 2598066.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1406137 + ... + 1406183.

Almost surely, 2^66089520 is an apocalyptic number.

66089520 is a gapful number since it is divisible by the number (60) 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 66089520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138276864).

66089520 is an abundant number, since it is smaller than the sum of its proper divisors (210464208).

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

66089520 is a wasteful number, since it uses less digits than its factorization.

66089520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 66089520 is about 8129.5461127913. The cubic root of 66089520 is about 404.3066325496.

The spelling of 66089520 in words is "sixty-six million, eighty-nine thousand, five hundred twenty".