64545691 has 6 divisors (see below), whose sum is σ = 75083820. Its totient is φ = 55324836.

The previous prime is 64545673. The next prime is 64545703. The reversal of 64545691 is 19654546.

It is a happy number.

It is not a de Polignac number, because 64545691 - 2⁷ = 64545563 is a prime.

It is a super-2 number, since 2×64545691² = 8332292453334962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64545601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658581 + ... + 658678.

It is an arithmetic number, because the mean of its divisors is an integer number (12513970).

Almost surely, 2^64545691 is an apocalyptic number.

64545691 is a deficient number, since it is larger than the sum of its proper divisors (10538129).

64545691 is a wasteful number, since it uses less digits than its factorization.

64545691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317273 (or 1317266 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 64545691 is about 8034.0332959230. The cubic root of 64545691 is about 401.1336403636.

The spelling of 64545691 in words is "sixty-four million, five hundred forty-five thousand, six hundred ninety-one".