64821736 has 16 divisors (see below), whose sum is σ = 138903840. Its totient is φ = 27780720.

The previous prime is 64821727. The next prime is 64821767. The reversal of 64821736 is 63712846.

It is a junction number, because it is equal to n+sod(n) for n = 64821695 and 64821704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578710 + ... + 578821.

It is an arithmetic number, because the mean of its divisors is an integer number (8681490).

Almost surely, 2^64821736 is an apocalyptic number.

It is an amenable number.

64821736 is an abundant number, since it is smaller than the sum of its proper divisors (74082104).

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

64821736 is a wasteful number, since it uses less digits than its factorization.

64821736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157544 (or 1157540 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 64821736 is about 8051.1946939569. The cubic root of 64821736 is about 401.7046748887.

The spelling of 64821736 in words is "sixty-four million, eight hundred twenty-one thousand, seven hundred thirty-six".