64634819 has 16 divisors (see below), whose sum is σ = 68717376. Its totient is φ = 60710400.

The previous prime is 64634809. The next prime is 64634831. The reversal of 64634819 is 91843646.

It is a cyclic number.

It is not a de Polignac number, because 64634819 - 2²⁴ = 47857603 is a prime.

It is a super-2 number, since 2×64634819² = 8355319654325522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64634809) 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 15 ways as a sum of consecutive naturals, for example, 207674 + ... + 207984.

It is an arithmetic number, because the mean of its divisors is an integer number (4294836).

Almost surely, 2^64634819 is an apocalyptic number.

64634819 is a deficient number, since it is larger than the sum of its proper divisors (4082557).

64634819 is a wasteful number, since it uses less digits than its factorization.

64634819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526.

The product of its digits is 124416, while the sum is 41.

The square root of 64634819 is about 8039.5782849600. The cubic root of 64634819 is about 401.3181907443.

The spelling of 64634819 in words is "sixty-four million, six hundred thirty-four thousand, eight hundred nineteen".