64699691 has 8 divisors (see below), whose sum is σ = 74675424. Its totient is φ = 54907200.

The previous prime is 64699669. The next prime is 64699703. The reversal of 64699691 is 19699646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64699691 - 2⁶ = 64699627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64699631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45050 + ... + 46463.

It is an arithmetic number, because the mean of its divisors is an integer number (9334428).

Almost surely, 2^64699691 is an apocalyptic number.

64699691 is a deficient number, since it is larger than the sum of its proper divisors (9975733).

64699691 is a wasteful number, since it uses less digits than its factorization.

64699691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91621.

The product of its digits is 629856, while the sum is 50.

The square root of 64699691 is about 8043.6118131098. The cubic root of 64699691 is about 401.4524094672.

The spelling of 64699691 in words is "sixty-four million, six hundred ninety-nine thousand, six hundred ninety-one".