51081672 has 16 divisors (see below), whose sum is σ = 127704240. Its totient is φ = 17027216.

The previous prime is 51081661. The next prime is 51081691. The reversal of 51081672 is 27618015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064178 + ... + 1064225.

It is an arithmetic number, because the mean of its divisors is an integer number (7981515).

Almost surely, 2^51081672 is an apocalyptic number.

It is an amenable number.

51081672 is an abundant number, since it is smaller than the sum of its proper divisors (76622568).

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

51081672 is a wasteful number, since it uses less digits than its factorization.

51081672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128412 (or 2128408 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 51081672 is about 7147.1443248335. The cubic root of 51081672 is about 371.0408287854.

Adding to 51081672 its reverse (27618015), we get a palindrome (78699687).

The spelling of 51081672 in words is "fifty-one million, eighty-one thousand, six hundred seventy-two".