64139829 has 8 divisors (see below), whose sum is σ = 92098272. Its totient is φ = 39470640.

The previous prime is 64139809. The next prime is 64139849. The reversal of 64139829 is 92893146.

It is an interprime number because it is at equal distance from previous prime (64139809) and next prime (64139849).

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

It is not a de Polignac number, because 64139829 - 2⁵ = 64139797 is a prime.

It is a super-2 number, since 2×64139829² = 8227835328298482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64139809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822267 + ... + 822344.

It is an arithmetic number, because the mean of its divisors is an integer number (11512284).

Almost surely, 2^64139829 is an apocalyptic number.

It is an amenable number.

64139829 is a deficient number, since it is larger than the sum of its proper divisors (27958443).

64139829 is a wasteful number, since it uses less digits than its factorization.

64139829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644627.

The product of its digits is 93312, while the sum is 42.

The square root of 64139829 is about 8008.7345442336. The cubic root of 64139829 is about 400.2910985194.

It can be divided in two parts, 641 and 39829, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 64139829 in words is "sixty-four million, one hundred thirty-nine thousand, eight hundred twenty-nine".