64329691 has 4 divisors (see below), whose sum is σ = 64836352. Its totient is φ = 63823032.

The previous prime is 64329679. The next prime is 64329719. The reversal of 64329691 is 19692346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19692346 = 2 ⋅9846173.

It is a cyclic number.

It is not a de Polignac number, because 64329691 - 2⁵ = 64329659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64329631) 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, 253140 + ... + 253393.

It is an arithmetic number, because the mean of its divisors is an integer number (16209088).

Almost surely, 2^64329691 is an apocalyptic number.

64329691 is a deficient number, since it is larger than the sum of its proper divisors (506661).

64329691 is a wasteful number, since it uses less digits than its factorization.

64329691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506660.

The product of its digits is 69984, while the sum is 40.

The square root of 64329691 is about 8020.5792184854. The cubic root of 64329691 is about 400.6856801851.

The spelling of 64329691 in words is "sixty-four million, three hundred twenty-nine thousand, six hundred ninety-one".