64128249 has 12 divisors (see below), whose sum is σ = 97505200. Its totient is φ = 40501944.

The previous prime is 64128247. The next prime is 64128277. The reversal of 64128249 is 94282146.

64128249 is a `hidden beast` number, since 641 + 2 + 8 + 2 + 4 + 9 = 666.

It is not a de Polignac number, because 64128249 - 2¹ = 64128247 is a prime.

It is a super-2 number, since 2×64128249² = 8224864639612002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64128247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187339 + ... + 187680.

Almost surely, 2^64128249 is an apocalyptic number.

It is an amenable number.

64128249 is a deficient number, since it is larger than the sum of its proper divisors (33376951).

64128249 is a wasteful number, since it uses less digits than its factorization.

64128249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375044 (or 375041 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 64128249 is about 8008.0115509407. The cubic root of 64128249 is about 400.2670071450.

The spelling of 64128249 in words is "sixty-four million, one hundred twenty-eight thousand, two hundred forty-nine".