51323136 has 72 divisors (see below), whose sum is σ = 144666144. Its totient is φ = 16097280.

The previous prime is 51323117. The next prime is 51323137. The reversal of 51323136 is 63132315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51323137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11091 + ... + 15021.

It is an arithmetic number, because the mean of its divisors is an integer number (2009252).

Almost surely, 2^51323136 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 51323136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72333072).

51323136 is an abundant number, since it is smaller than the sum of its proper divisors (93343008).

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

51323136 is a wasteful number, since it uses less digits than its factorization.

51323136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967 (or 3953 counting only the distinct ones).

The product of its digits is 1620, while the sum is 24.

The square root of 51323136 is about 7164.0167503992. The cubic root of 51323136 is about 371.6245489306.

The spelling of 51323136 in words is "fifty-one million, three hundred twenty-three thousand, one hundred thirty-six".