51269472 has 72 divisors (see below), whose sum is σ = 148029336. Its totient is φ = 16828416.

The previous prime is 51269453. The next prime is 51269473. The reversal of 51269472 is 27496215.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51269473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17968 + ... + 20624.

It is an arithmetic number, because the mean of its divisors is an integer number (2055963).

Almost surely, 2^51269472 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 51269472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74014668).

51269472 is an abundant number, since it is smaller than the sum of its proper divisors (96759864).

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

51269472 is a wasteful number, since it uses less digits than its factorization.

51269472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740 (or 2729 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 51269472 is about 7160.2703859561. The cubic root of 51269472 is about 371.4949789406.

The spelling of 51269472 in words is "fifty-one million, two hundred sixty-nine thousand, four hundred seventy-two".