64040249 has 16 divisors (see below), whose sum is σ = 79567488. Its totient is φ = 50188032.

The previous prime is 64040233. The next prime is 64040261. The reversal of 64040249 is 94204046.

It is a cyclic number.

It is not a de Polignac number, because 64040249 - 2⁴ = 64040233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64040209) 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, 6449 + ... + 13025.

It is an arithmetic number, because the mean of its divisors is an integer number (4972968).

Almost surely, 2^64040249 is an apocalyptic number.

It is an amenable number.

64040249 is a deficient number, since it is larger than the sum of its proper divisors (15527239).

64040249 is a wasteful number, since it uses less digits than its factorization.

64040249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 64040249 is about 8002.5151671209. The cubic root of 64040249 is about 400.0838345115.

It can be divided in two parts, 6404024 and 9, that multiplied together give a triangular number (57636216 = T₁₀₇₃₆).

The spelling of 64040249 in words is "sixty-four million, forty thousand, two hundred forty-nine".