64992257 has 16 divisors (see below), whose sum is σ = 74027520. Its totient is φ = 56534400.

The previous prime is 64992247. The next prime is 64992269. The reversal of 64992257 is 75229946.

It is a cyclic number.

It is not a de Polignac number, because 64992257 - 2¹⁶ = 64926721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64992247) 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, 22544 + ... + 25262.

It is an arithmetic number, because the mean of its divisors is an integer number (4626720).

Almost surely, 2^64992257 is an apocalyptic number.

It is an amenable number.

64992257 is a deficient number, since it is larger than the sum of its proper divisors (9035263).

64992257 is a wasteful number, since it uses less digits than its factorization.

64992257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824.

The product of its digits is 272160, while the sum is 44.

The square root of 64992257 is about 8061.7775335220. Note that the first 3 decimals coincide. The cubic root of 64992257 is about 402.0566098508.

The spelling of 64992257 in words is "sixty-four million, nine hundred ninety-two thousand, two hundred fifty-seven".