68442529 has 3 divisors (see below), whose sum is σ = 68450803. Its totient is φ = 68434256.

The previous prime is 68442499. The next prime is 68442533. The reversal of 68442529 is 92524486.

The square root of 68442529 is 8273.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92524486 = 2 ⋅46262243.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 16386304 = 7215^2 + 4048^2 .

It is not a de Polignac number, because 68442529 - 2⁵ = 68442497 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68442491 and 68442500.

It is not an unprimeable number, because it can be changed into a prime (68442589) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4137 + ... + 12409.

Almost surely, 2^68442529 is an apocalyptic number.

68442529 is the 8273-rd square number.

68442529 is the 4137-th centered octagonal number.

It is an amenable number.

68442529 is a deficient number, since it is larger than the sum of its proper divisors (8274).

68442529 is an frugal number, since it uses more digits than its factorization.

68442529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16546 (or 8273 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The cubic root of 68442529 is about 409.0490134409.

The spelling of 68442529 in words is "sixty-eight million, four hundred forty-two thousand, five hundred twenty-nine".