65021320 has 64 divisors (see below), whose sum is σ = 180069120. Its totient is φ = 20577024.

The previous prime is 65021317. The next prime is 65021329. The reversal of 65021320 is 2312056.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (65021329) 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, 5292 + ... + 12571.

It is an arithmetic number, because the mean of its divisors is an integer number (2813580).

Almost surely, 2^65021320 is an apocalyptic number.

It is an amenable number.

65021320 is an abundant number, since it is smaller than the sum of its proper divisors (115047800).

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

65021320 is a wasteful number, since it uses less digits than its factorization.

65021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17894 (or 17890 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 65021320 is about 8063.5798501658. The cubic root of 65021320 is about 402.1165309885.

Adding to 65021320 its reverse (2312056), we get a palindrome (67333376).

It can be divided in two parts, 65021 and 320, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 65021320 in words is "sixty-five million, twenty-one thousand, three hundred twenty".