67145729 has 6 divisors (see below), whose sum is σ = 78108354. Its totient is φ = 57553440.

The previous prime is 67145693. The next prime is 67145737. The reversal of 67145729 is 92754176.

It can be written as a sum of positive squares in only one way, i.e., 52591504 + 14554225 = 7252^2 + 3815^2 .

It is not a de Polignac number, because 67145729 - 2²⁰ = 66097153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67145779) 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, 685112 + ... + 685209.

It is an arithmetic number, because the mean of its divisors is an integer number (13018059).

Almost surely, 2^67145729 is an apocalyptic number.

It is an amenable number.

67145729 is a deficient number, since it is larger than the sum of its proper divisors (10962625).

67145729 is a wasteful number, since it uses less digits than its factorization.

67145729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370335 (or 1370328 counting only the distinct ones).

The product of its digits is 105840, while the sum is 41.

The square root of 67145729 is about 8194.2497521128. The cubic root of 67145729 is about 406.4490671253.

The spelling of 67145729 in words is "sixty-seven million, one hundred forty-five thousand, seven hundred twenty-nine".