65081394 has 80 divisors (see below), whose sum is σ = 172497600. Its totient is φ = 17944416.

The previous prime is 65081383. The next prime is 65081407. The reversal of 65081394 is 49318056.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31897 + ... + 33875.

It is an arithmetic number, because the mean of its divisors is an integer number (2156220).

Almost surely, 2^65081394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65081394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86248800).

65081394 is an abundant number, since it is smaller than the sum of its proper divisors (107416206).

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

65081394 is a wasteful number, since it uses less digits than its factorization.

65081394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2020 counting only the distinct ones).

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

The square root of 65081394 is about 8067.3040106345. The cubic root of 65081394 is about 402.2403330108.

The spelling of 65081394 in words is "sixty-five million, eighty-one thousand, three hundred ninety-four".