64491255 has 32 divisors (see below), whose sum is σ = 116121600. Its totient is φ = 33954336.

The previous prime is 64491239. The next prime is 64491257. The reversal of 64491255 is 55219446.

64491255 is a `hidden beast` number, since 644 + 9 + 1 + 2 + 5 + 5 = 666.

It is not a de Polignac number, because 64491255 - 2⁴ = 64491239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64491257) 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, 7642 + ... + 13688.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^64491255 is an apocalyptic number.

64491255 is a deficient number, since it is larger than the sum of its proper divisors (51630345).

64491255 is a wasteful number, since it uses less digits than its factorization.

64491255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140 (or 6134 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 64491255 is about 8030.6447437301. The cubic root of 64491255 is about 401.0208404125.

It can be divided in two parts, 64491 and 255, that added together give a palindrome (64746).

The spelling of 64491255 in words is "sixty-four million, four hundred ninety-one thousand, two hundred fifty-five".