51072012 has 48 divisors (see below), whose sum is σ = 140202720. Its totient is φ = 16022016.

The previous prime is 51071941. The next prime is 51072017. The reversal of 51072012 is 21027015.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51072017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12073 + ... + 15744.

It is an arithmetic number, because the mean of its divisors is an integer number (2920890).

Almost surely, 2^51072012 is an apocalyptic number.

It is an amenable number.

51072012 is an abundant number, since it is smaller than the sum of its proper divisors (89130708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51072012 is a wasteful number, since it uses less digits than its factorization.

51072012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27847 (or 27839 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51072012 is about 7146.4684984963. The cubic root of 51072012 is about 371.0174382670.

Adding to 51072012 its reverse (21027015), we get a palindrome (72099027).

The spelling of 51072012 in words is "fifty-one million, seventy-two thousand, twelve".