64197309 has 16 divisors (see below), whose sum is σ = 93556224. Its totient is φ = 38833200.

The previous prime is 64197307. The next prime is 64197319. The reversal of 64197309 is 90379146.

It is not a de Polignac number, because 64197309 - 2¹ = 64197307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64197307) 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, 19282 + ... + 22364.

It is an arithmetic number, because the mean of its divisors is an integer number (5847264).

Almost surely, 2^64197309 is an apocalyptic number.

It is an amenable number.

64197309 is a deficient number, since it is larger than the sum of its proper divisors (29358915).

64197309 is a wasteful number, since it uses less digits than its factorization.

64197309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 64197309 is about 8012.3223225230. The cubic root of 64197309 is about 400.4106387120.

The spelling of 64197309 in words is "sixty-four million, one hundred ninety-seven thousand, three hundred nine".