65366820 has 36 divisors (see below), whose sum is σ = 198279900. Its totient is φ = 17431104.

The previous prime is 65366813. The next prime is 65366849. The reversal of 65366820 is 2866356.

It can be written as a sum of positive squares in 2 ways, for example, as 28132416 + 37234404 = 5304^2 + 6102^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 181395 + ... + 181754.

It is an arithmetic number, because the mean of its divisors is an integer number (5507775).

Almost surely, 2^65366820 is an apocalyptic number.

65366820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65366820 is an abundant number, since it is smaller than the sum of its proper divisors (132913080).

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

65366820 is a wasteful number, since it uses less digits than its factorization.

65366820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363164 (or 363159 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 65366820 is about 8084.9749535790. The cubic root of 65366820 is about 402.8275075745.

The spelling of 65366820 in words is "sixty-five million, three hundred sixty-six thousand, eight hundred twenty".