51060240 has 320 divisors, whose sum is σ = 219985920. Its totient is φ = 10575360.

The previous prime is 51060227. The next prime is 51060301. The reversal of 51060240 is 4206015.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 166167 + ... + 166473.

It is an arithmetic number, because the mean of its divisors is an integer number (687456).

Almost surely, 2^51060240 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 51060240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109992960).

51060240 is an abundant number, since it is smaller than the sum of its proper divisors (168925680).

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

51060240 is a wasteful number, since it uses less digits than its factorization.

51060240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51060240 is about 7145.6448274456. The cubic root of 51060240 is about 370.9889298092.

Adding to 51060240 its reverse (4206015), we get a palindrome (55266255).

The spelling of 51060240 in words is "fifty-one million, sixty thousand, two hundred forty".