64215829 has 2 divisors, whose sum is σ = 64215830. Its totient is φ = 64215828.

The previous prime is 64215797. The next prime is 64215841. The reversal of 64215829 is 92851246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59367025 + 4848804 = 7705^2 + 2202^2 .

It is a cyclic number.

It is not a de Polignac number, because 64215829 - 2⁵ = 64215797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64215869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32107914 + 32107915.

It is an arithmetic number, because the mean of its divisors is an integer number (32107915).

Almost surely, 2^64215829 is an apocalyptic number.

It is an amenable number.

64215829 is a deficient number, since it is larger than the sum of its proper divisors (1).

64215829 is an equidigital number, since it uses as much as digits as its factorization.

64215829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 64215829 is about 8013.4779590388. The cubic root of 64215829 is about 400.4491392461.

It can be divided in two parts, 642 and 15829, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 64215829 in words is "sixty-four million, two hundred fifteen thousand, eight hundred twenty-nine".