64836820 has 24 divisors (see below), whose sum is σ = 136387944. Its totient is φ = 25890816.

The previous prime is 64836817. The next prime is 64836823. The reversal of 64836820 is 2863846.

It is an interprime number because it is at equal distance from previous prime (64836817) and next prime (64836823).

It can be written as a sum of positive squares in 4 ways, for example, as 2116 + 64834704 = 46^2 + 8052^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64836820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64836823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11052 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (5682831).

Almost surely, 2^64836820 is an apocalyptic number.

It is an amenable number.

64836820 is an abundant number, since it is smaller than the sum of its proper divisors (71551124).

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

64836820 is a wasteful number, since it uses less digits than its factorization.

64836820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499 (or 5497 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 64836820 is about 8052.1313948544. The cubic root of 64836820 is about 401.7358313276.

It can be divided in two parts, 64836 and 820, that added together give a palindrome (65656).

The spelling of 64836820 in words is "sixty-four million, eight hundred thirty-six thousand, eight hundred twenty".