65726820 has 72 divisors (see below), whose sum is σ = 205820160. Its totient is φ = 16960320.

The previous prime is 65726819. The next prime is 65726839. The reversal of 65726820 is 2862756.

65726820 is a `hidden beast` number, since 6 + 572 + 6 + 82 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310 + ... + 11469.

Almost surely, 2^65726820 is an apocalyptic number.

65726820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65726820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102910080).

65726820 is an abundant number, since it is smaller than the sum of its proper divisors (140093340).

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

65726820 is a wasteful number, since it uses less digits than its factorization.

65726820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11825 (or 11820 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 65726820 is about 8107.2079040814. The cubic root of 65726820 is about 403.5656623516.

The spelling of 65726820 in words is "sixty-five million, seven hundred twenty-six thousand, eight hundred twenty".