64197829 has 4 divisors (see below), whose sum is σ = 64447884. Its totient is φ = 63947776.

The previous prime is 64197811. The next prime is 64197863. The reversal of 64197829 is 92879146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92879146 = 2 ⋅46439573.

It can be written as a sum of positive squares in 2 ways, for example, as 49773025 + 14424804 = 7055^2 + 3798^2 .

It is a cyclic number.

It is not a de Polignac number, because 64197829 - 2¹⁵ = 64165061 is a prime.

It is a super-3 number, since 3×64197829³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64197229) 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, 124642 + ... + 125155.

It is an arithmetic number, because the mean of its divisors is an integer number (16111971).

Almost surely, 2^64197829 is an apocalyptic number.

It is an amenable number.

64197829 is a deficient number, since it is larger than the sum of its proper divisors (250055).

64197829 is a wasteful number, since it uses less digits than its factorization.

64197829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250054.

The product of its digits is 217728, while the sum is 46.

The square root of 64197829 is about 8012.3547724748. The cubic root of 64197829 is about 400.4117198216.

The spelling of 64197829 in words is "sixty-four million, one hundred ninety-seven thousand, eight hundred twenty-nine".