51069729 has 8 divisors (see below), whose sum is σ = 71053632. Its totient is φ = 32566160.

The previous prime is 51069727. The next prime is 51069761. The reversal of 51069729 is 92796015.

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

It is not a de Polignac number, because 51069729 - 2¹ = 51069727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51069721) 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, 370002 + ... + 370139.

It is an arithmetic number, because the mean of its divisors is an integer number (8881704).

Almost surely, 2^51069729 is an apocalyptic number.

It is an amenable number.

51069729 is a deficient number, since it is larger than the sum of its proper divisors (19983903).

51069729 is a wasteful number, since it uses less digits than its factorization.

51069729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740167.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 51069729 is about 7146.3087674687. The cubic root of 51069729 is about 371.0119098285.

The spelling of 51069729 in words is "fifty-one million, sixty-nine thousand, seven hundred twenty-nine".