65512420 has 36 divisors (see below), whose sum is σ = 140096124. Its totient is φ = 25733440.

The previous prime is 65512417. The next prime is 65512423. The reversal of 65512420 is 2421556.

It is an interprime number because it is at equal distance from previous prime (65512417) and next prime (65512423).

It can be written as a sum of positive squares in 2 ways, for example, as 32080896 + 33431524 = 5664^2 + 5782^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65512423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69150 + ... + 70090.

It is an arithmetic number, because the mean of its divisors is an integer number (3891559).

Almost surely, 2^65512420 is an apocalyptic number.

It is an amenable number.

65512420 is an abundant number, since it is smaller than the sum of its proper divisors (74583704).

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

65512420 is a wasteful number, since it uses less digits than its factorization.

65512420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 65512420 is about 8093.9743019113. The cubic root of 65512420 is about 403.1263757740.

Adding to 65512420 its reverse (2421556), we get a palindrome (67933976).

The spelling of 65512420 in words is "sixty-five million, five hundred twelve thousand, four hundred twenty".