68478529 has 6 divisors (see below), whose sum is σ = 79658754. Its totient is φ = 58695840.

The previous prime is 68478511. The next prime is 68478551. The reversal of 68478529 is 92587486.

It can be written as a sum of positive squares in only one way, i.e., 58110129 + 10368400 = 7623^2 + 3220^2 .

It is not a de Polignac number, because 68478529 - 2⁷ = 68478401 is a prime.

It is a super-3 number, since 3×68478529³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1397521 = 68478529 / (6 + 8 + 4 + 7 + 8 + 5 + 2 + 9).

It is not an unprimeable number, because it can be changed into a prime (68478029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 698712 + ... + 698809.

It is an arithmetic number, because the mean of its divisors is an integer number (13276459).

Almost surely, 2^68478529 is an apocalyptic number.

It is an amenable number.

68478529 is a deficient number, since it is larger than the sum of its proper divisors (11180225).

68478529 is a wasteful number, since it uses less digits than its factorization.

68478529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397535 (or 1397528 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The square root of 68478529 is about 8275.1754664176. The cubic root of 68478529 is about 409.1207192628.

It can be divided in two parts, 6847 and 8529, that added together give a square (15376 = 124²).

The spelling of 68478529 in words is "sixty-eight million, four hundred seventy-eight thousand, five hundred twenty-nine".