51212736 has 168 divisors, whose sum is σ = 158099760. Its totient is φ = 16422912.

The previous prime is 51212717. The next prime is 51212779. The reversal of 51212736 is 63721215.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 575380 + ... + 575468.

It is an arithmetic number, because the mean of its divisors is an integer number (941070).

Almost surely, 2^51212736 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 51212736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79049880).

51212736 is an abundant number, since it is smaller than the sum of its proper divisors (106887024).

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

51212736 is an equidigital number, since it uses as much as digits as its factorization.

51212736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 131 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 51212736 is about 7156.3074277172. The cubic root of 51212736 is about 371.3578933424.

The spelling of 51212736 in words is "fifty-one million, two hundred twelve thousand, seven hundred thirty-six".