51081732 has 48 divisors (see below), whose sum is σ = 142625280. Its totient is φ = 15717024.

The previous prime is 51081727. The next prime is 51081733. The reversal of 51081732 is 23718015.

51081732 is a `hidden beast` number, since 510 + 81 + 73 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51081696 and 51081705.

It is not an unprimeable number, because it can be changed into a prime (51081733) 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, 16788 + ... + 19595.

It is an arithmetic number, because the mean of its divisors is an integer number (2971360).

Almost surely, 2^51081732 is an apocalyptic number.

51081732 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51081732 is an abundant number, since it is smaller than the sum of its proper divisors (91543548).

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

51081732 is a wasteful number, since it uses less digits than its factorization.

51081732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36409 (or 36401 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 51081732 is about 7147.1485223129. The cubic root of 51081732 is about 371.0409740590.

Adding to 51081732 its reverse (23718015), we get a palindrome (74799747).

The spelling of 51081732 in words is "fifty-one million, eighty-one thousand, seven hundred thirty-two".