65403520 has 128 divisors (see below), whose sum is σ = 192608640. Its totient is φ = 20680704.

The previous prime is 65403517. The next prime is 65403523. The reversal of 65403520 is 2530456.

It is an interprime number because it is at equal distance from previous prime (65403517) and next prime (65403523).

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (65403523) 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, 57679 + ... + 58801.

It is an arithmetic number, because the mean of its divisors is an integer number (1504755).

Almost surely, 2^65403520 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 65403520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96304320).

65403520 is an abundant number, since it is smaller than the sum of its proper divisors (127205120).

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

65403520 is a wasteful number, since it uses less digits than its factorization.

65403520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 65403520 is about 8087.2442772554. The cubic root of 65403520 is about 402.9028822249.

Adding to 65403520 its reverse (2530456), we get a palindrome (67933976).

The spelling of 65403520 in words is "sixty-five million, four hundred three thousand, five hundred twenty".