65445580 has 48 divisors (see below), whose sum is σ = 151865280. Its totient is φ = 23564288.

The previous prime is 65445539. The next prime is 65445617. The reversal of 65445580 is 8554456.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3636 + ... + 12004.

It is an arithmetic number, because the mean of its divisors is an integer number (3163860).

Almost surely, 2^65445580 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 65445580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75932640).

65445580 is an abundant number, since it is smaller than the sum of its proper divisors (86419700).

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

65445580 is a wasteful number, since it uses less digits than its factorization.

65445580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8418 (or 8416 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 65445580 is about 8089.8442506639. The cubic root of 65445580 is about 402.9892306046.

The spelling of 65445580 in words is "sixty-five million, four hundred forty-five thousand, five hundred eighty".