64217755 has 32 divisors (see below), whose sum is σ = 95803776. Its totient is φ = 40310784.

The previous prime is 64217753. The next prime is 64217759. The reversal of 64217755 is 55771246.

It is a 11-Lehmer number, since φ(64217755) divides (64217755-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 64217755 - 2¹ = 64217753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64217753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20557 + ... + 23473.

It is an arithmetic number, because the mean of its divisors is an integer number (2993868).

Almost surely, 2^64217755 is an apocalyptic number.

64217755 is a deficient number, since it is larger than the sum of its proper divisors (31586021).

64217755 is a wasteful number, since it uses less digits than its factorization.

64217755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983.

The product of its digits is 58800, while the sum is 37.

The square root of 64217755 is about 8013.5981306776. The cubic root of 64217755 is about 400.4531427104.

The spelling of 64217755 in words is "sixty-four million, two hundred seventeen thousand, seven hundred fifty-five".