65390000 has 100 divisors (see below), whose sum is σ = 170832816. Its totient is φ = 24096000.

The previous prime is 65389999. The next prime is 65390009. The reversal of 65390000 is 9356.

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (65390009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 129749 + ... + 130251.

Almost surely, 2^65390000 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 65390000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85416408).

65390000 is an abundant number, since it is smaller than the sum of its proper divisors (105442816).

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

65390000 is a wasteful number, since it uses less digits than its factorization.

65390000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 65390000 is about 8086.4083498176. The cubic root of 65390000 is about 402.8751180599.

Adding to 65390000 its reverse (9356), we get a palindrome (65399356).

The spelling of 65390000 in words is "sixty-five million, three hundred ninety thousand".