64539620 has 12 divisors (see below), whose sum is σ = 135533244. Its totient is φ = 25815840.

The previous prime is 64539589. The next prime is 64539641. The reversal of 64539620 is 2693546.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 33825856 = 5542^2 + 5816^2 .

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, 1613471 + ... + 1613510.

It is an arithmetic number, because the mean of its divisors is an integer number (11294437).

Almost surely, 2^64539620 is an apocalyptic number.

It is an amenable number.

64539620 is an abundant number, since it is smaller than the sum of its proper divisors (70993624).

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

64539620 is a wasteful number, since it uses less digits than its factorization.

64539620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226990 (or 3226988 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 64539620 is about 8033.6554568889. The cubic root of 64539620 is about 401.1210634400.

The spelling of 64539620 in words is "sixty-four million, five hundred thirty-nine thousand, six hundred twenty".