64366809 has 16 divisors (see below), whose sum is σ = 92918784. Its totient is φ = 39398400.

The previous prime is 64366807. The next prime is 64366823. The reversal of 64366809 is 90866346.

It is not a de Polignac number, because 64366809 - 2¹ = 64366807 is a prime.

It is a super-2 number, since 2×64366809² = 8286172201684962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64366807) 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, 3129 + ... + 11769.

It is an arithmetic number, because the mean of its divisors is an integer number (5807424).

Almost surely, 2^64366809 is an apocalyptic number.

It is an amenable number.

64366809 is a deficient number, since it is larger than the sum of its proper divisors (28551975).

64366809 is a wasteful number, since it uses less digits than its factorization.

64366809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8848.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 64366809 is about 8022.8928074604. The cubic root of 64366809 is about 400.7627300992.

The spelling of 64366809 in words is "sixty-four million, three hundred sixty-six thousand, eight hundred nine".