51239280 has 160 divisors (see below), whose sum is σ = 167989248. Its totient is φ = 12902400.

The previous prime is 51239269. The next prime is 51239281. The reversal of 51239280 is 8293215.

It is a happy number.

51239280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51239281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 528192 + ... + 528288.

Almost surely, 2^51239280 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 51239280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83994624).

51239280 is an abundant number, since it is smaller than the sum of its proper divisors (116749968).

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

51239280 is a wasteful number, since it uses less digits than its factorization.

51239280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51239280 is about 7158.1617752046. The cubic root of 51239280 is about 371.4220415871.

The spelling of 51239280 in words is "fifty-one million, two hundred thirty-nine thousand, two hundred eighty".