64553620 has 12 divisors (see below), whose sum is σ = 135562644. Its totient is φ = 25821440.

The previous prime is 64553581. The next prime is 64553647. The reversal of 64553620 is 2635546.

It can be written as a sum of positive squares in 2 ways, for example, as 23951236 + 40602384 = 4894^2 + 6372^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1613821 + ... + 1613860.

It is an arithmetic number, because the mean of its divisors is an integer number (11296887).

Almost surely, 2^64553620 is an apocalyptic number.

It is an amenable number.

64553620 is an abundant number, since it is smaller than the sum of its proper divisors (71009024).

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

64553620 is a wasteful number, since it uses less digits than its factorization.

64553620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227690 (or 3227688 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 64553620 is about 8034.5267439968. The cubic root of 64553620 is about 401.1500652060.

The spelling of 64553620 in words is "sixty-four million, five hundred fifty-three thousand, six hundred twenty".