65216380 has 24 divisors (see below), whose sum is σ = 140141232. Its totient is φ = 25479552.

The previous prime is 65216357. The next prime is 65216399. The reversal of 65216380 is 8361256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37057 + ... + 38776.

It is an arithmetic number, because the mean of its divisors is an integer number (5839218).

Almost surely, 2^65216380 is an apocalyptic number.

It is an amenable number.

65216380 is an abundant number, since it is smaller than the sum of its proper divisors (74924852).

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

65216380 is a wasteful number, since it uses less digits than its factorization.

65216380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75885 (or 75883 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 65216380 is about 8075.6659168145. The cubic root of 65216380 is about 402.5182379247.

The spelling of 65216380 in words is "sixty-five million, two hundred sixteen thousand, three hundred eighty".