64215055 has 4 divisors (see below), whose sum is σ = 77058072. Its totient is φ = 51372040.

The previous prime is 64215029. The next prime is 64215097. The reversal of 64215055 is 55051246.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64215055 - 2⁵ = 64215023 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 6421501 + ... + 6421510.

It is an arithmetic number, because the mean of its divisors is an integer number (19264518).

Almost surely, 2^64215055 is an apocalyptic number.

64215055 is a deficient number, since it is larger than the sum of its proper divisors (12843017).

64215055 is a wasteful number, since it uses less digits than its factorization.

64215055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843016.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 64215055 is about 8013.4296652557. The cubic root of 64215055 is about 400.4475303547.

It can be divided in two parts, 6421 and 5055, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 64215055 in words is "sixty-four million, two hundred fifteen thousand, fifty-five".