64891297 has 4 divisors (see below), whose sum is σ = 65486740. Its totient is φ = 64295856.

The previous prime is 64891279. The next prime is 64891361. The reversal of 64891297 is 79219846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36917776 + 27973521 = 6076^2 + 5289^2 .

It is a cyclic number.

It is not a de Polignac number, because 64891297 - 2¹¹ = 64889249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64891217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297558 + ... + 297775.

It is an arithmetic number, because the mean of its divisors is an integer number (16371685).

Almost surely, 2^64891297 is an apocalyptic number.

It is an amenable number.

64891297 is a deficient number, since it is larger than the sum of its proper divisors (595443).

64891297 is a wasteful number, since it uses less digits than its factorization.

64891297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595442.

The product of its digits is 217728, while the sum is 46.

The square root of 64891297 is about 8055.5134535298. The cubic root of 64891297 is about 401.8483149250.

The spelling of 64891297 in words is "sixty-four million, eight hundred ninety-one thousand, two hundred ninety-seven".