64228491 has 16 divisors (see below), whose sum is σ = 95334400. Its totient is φ = 42737544.

The previous prime is 64228487. The next prime is 64228511. The reversal of 64228491 is 19482246.

64228491 is a `hidden beast` number, since 642 + 2 + 8 + 4 + 9 + 1 = 666.

It is not a de Polignac number, because 64228491 - 2² = 64228487 is a prime.

It is a super-2 number, since 2×64228491² = 8250598112274162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64228441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14430 + ... + 18348.

It is an arithmetic number, because the mean of its divisors is an integer number (5958400).

Almost surely, 2^64228491 is an apocalyptic number.

64228491 is a deficient number, since it is larger than the sum of its proper divisors (31105909).

64228491 is a wasteful number, since it uses less digits than its factorization.

64228491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535 (or 4529 counting only the distinct ones).

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

The square root of 64228491 is about 8014.2679640751. The cubic root of 64228491 is about 400.4754575431.

The spelling of 64228491 in words is "sixty-four million, two hundred twenty-eight thousand, four hundred ninety-one".