64073729 has 8 divisors (see below), whose sum is σ = 65258472. Its totient is φ = 62893440.

The previous prime is 64073717. The next prime is 64073743. The reversal of 64073729 is 92737046.

It can be written as a sum of positive squares in 4 ways, for example, as 19784704 + 44289025 = 4448^2 + 6655^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-64073729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64073692 and 64073701.

It is not an unprimeable number, because it can be changed into a prime (64073329) 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, 43997 + ... + 45429.

It is an arithmetic number, because the mean of its divisors is an integer number (8157309).

Almost surely, 2^64073729 is an apocalyptic number.

It is an amenable number.

64073729 is a deficient number, since it is larger than the sum of its proper divisors (1184743).

64073729 is a wasteful number, since it uses less digits than its factorization.

64073729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 64073729 is about 8004.6067361239. The cubic root of 64073729 is about 400.1535431371.

The spelling of 64073729 in words is "sixty-four million, seventy-three thousand, seven hundred twenty-nine".