65399928 has 64 divisors (see below), whose sum is σ = 179435520. Its totient is φ = 19699200.

The previous prime is 65399927. The next prime is 65399941. The reversal of 65399928 is 82999356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65399927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49776 + ... + 51072.

It is an arithmetic number, because the mean of its divisors is an integer number (2803680).

Almost surely, 2^65399928 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 65399928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89717760).

65399928 is an abundant number, since it is smaller than the sum of its proper divisors (114035592).

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

65399928 is a wasteful number, since it uses less digits than its factorization.

65399928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1504 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 65399928 is about 8087.0221960868. The cubic root of 65399928 is about 402.8955062017.

It can be divided in two parts, 65 and 399928, that added together give a palindrome (399993).

The spelling of 65399928 in words is "sixty-five million, three hundred ninety-nine thousand, nine hundred twenty-eight".