51436816 has 20 divisors (see below), whose sum is σ = 100181212. Its totient is φ = 25583616.

The previous prime is 51436813. The next prime is 51436823. The reversal of 51436816 is 61863415.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36966400 + 14470416 = 6080^2 + 3804^2 .

It is not an unprimeable number, because it can be changed into a prime (51436813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5241 + ... + 11416.

Almost surely, 2^51436816 is an apocalyptic number.

It is an amenable number.

51436816 is a deficient number, since it is larger than the sum of its proper divisors (48744396).

51436816 is a wasteful number, since it uses less digits than its factorization.

51436816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16858 (or 16852 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 51436816 is about 7171.9464582497. The cubic root of 51436816 is about 371.8987275871.

The spelling of 51436816 in words is "fifty-one million, four hundred thirty-six thousand, eight hundred sixteen".