64500691 has 4 divisors (see below), whose sum is σ = 64777752. Its totient is φ = 64223632.

The previous prime is 64500673. The next prime is 64500697. The reversal of 64500691 is 19600546.

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

It is a cyclic number.

It is not a de Polignac number, because 64500691 - 2⁹ = 64500179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64500697) 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, 138181 + ... + 138646.

It is an arithmetic number, because the mean of its divisors is an integer number (16194438).

Almost surely, 2^64500691 is an apocalyptic number.

64500691 is a deficient number, since it is larger than the sum of its proper divisors (277061).

64500691 is a wasteful number, since it uses less digits than its factorization.

64500691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277060.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 64500691 is about 8031.2322217702. The cubic root of 64500691 is about 401.0403978347.

The spelling of 64500691 in words is "sixty-four million, five hundred thousand, six hundred ninety-one".