64709620 has 24 divisors (see below), whose sum is σ = 136337544. Its totient is φ = 25798656.

The previous prime is 64709597. The next prime is 64709639. The reversal of 64709620 is 2690746.

It can be written as a sum of positive squares in 4 ways, for example, as 6370576 + 58339044 = 2524^2 + 7638^2 .

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, 1092 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (5680731).

Almost surely, 2^64709620 is an apocalyptic number.

It is an amenable number.

64709620 is an abundant number, since it is smaller than the sum of its proper divisors (71627924).

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

64709620 is a wasteful number, since it uses less digits than its factorization.

64709620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10659 (or 10657 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 64709620 is about 8044.2289872927. The cubic root of 64709620 is about 401.4729444292.

The spelling of 64709620 in words is "sixty-four million, seven hundred nine thousand, six hundred twenty".