65089980 has 144 divisors (see below), whose sum is σ = 209139840. Its totient is φ = 16987968.

The previous prime is 65089979. The next prime is 65090009. The reversal of 65089980 is 8998056.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 286627 + ... + 286853.

It is an arithmetic number, because the mean of its divisors is an integer number (1452360).

Almost surely, 2^65089980 is an apocalyptic number.

65089980 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 65089980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104569920).

65089980 is an abundant number, since it is smaller than the sum of its proper divisors (144049860).

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

65089980 is a wasteful number, since it uses less digits than its factorization.

65089980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 65089980 is about 8067.8361411224. The cubic root of 65089980 is about 402.2580210340.

The spelling of 65089980 in words is "sixty-five million, eighty-nine thousand, nine hundred eighty".