64220655 has 32 divisors (see below), whose sum is σ = 105025536. Its totient is φ = 33502464.

The previous prime is 64220647. The next prime is 64220671. The reversal of 64220655 is 55602246.

It is not a de Polignac number, because 64220655 - 2³ = 64220647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244054 + ... + 244316.

It is an arithmetic number, because the mean of its divisors is an integer number (3282048).

Almost surely, 2^64220655 is an apocalyptic number.

64220655 is a deficient number, since it is larger than the sum of its proper divisors (40804881).

64220655 is a wasteful number, since it uses less digits than its factorization.

64220655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 64220655 is about 8013.7790710750. The cubic root of 64220655 is about 400.4591706208.

The spelling of 64220655 in words is "sixty-four million, two hundred twenty thousand, six hundred fifty-five".