51816996 has 240 divisors, whose sum is σ = 176934912. Its totient is φ = 12830400.

The previous prime is 51816991. The next prime is 51817001. The reversal of 51816996 is 69961815.

It is an interprime number because it is at equal distance from previous prime (51816991) and next prime (51817001).

It is not an unprimeable number, because it can be changed into a prime (51816991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 773355 + ... + 773421.

Almost surely, 2^51816996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51816996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88467456).

51816996 is an abundant number, since it is smaller than the sum of its proper divisors (125117916).

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

51816996 is a wasteful number, since it uses less digits than its factorization.

51816996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 121 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 51816996 is about 7198.4023227380. The cubic root of 51816996 is about 372.8127391774.

The spelling of 51816996 in words is "fifty-one million, eight hundred sixteen thousand, nine hundred ninety-six".