51145472 has 36 divisors (see below), whose sum is σ = 116679696. Its totient is φ = 21918720.

The previous prime is 51145463. The next prime is 51145499. The reversal of 51145472 is 27454115.

It is a super-2 number, since 2×51145472² = 5231718612205568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

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, 12479 + ... + 16062.

Almost surely, 2^51145472 is an apocalyptic number.

It is an amenable number.

51145472 is an abundant number, since it is smaller than the sum of its proper divisors (65534224).

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

51145472 is an equidigital number, since it uses as much as digits as its factorization.

51145472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28564 (or 28550 counting only the distinct ones).

The product of its digits is 5600, while the sum is 29.

The square root of 51145472 is about 7151.6062531434. The cubic root of 51145472 is about 371.1952387419.

Adding to 51145472 its reverse (27454115), we get a palindrome (78599587).

The spelling of 51145472 in words is "fifty-one million, one hundred forty-five thousand, four hundred seventy-two".