51417240 has 64 divisors (see below), whose sum is σ = 176290560. Its totient is φ = 11752320.

The previous prime is 51417221. The next prime is 51417241. The reversal of 51417240 is 4271415.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51417240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51417241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29766 + ... + 31445.

It is an arithmetic number, because the mean of its divisors is an integer number (2754540).

Almost surely, 2^51417240 is an apocalyptic number.

It is an amenable number.

51417240 is an abundant number, since it is smaller than the sum of its proper divisors (124873320).

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

51417240 is a wasteful number, since it uses less digits than its factorization.

51417240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61232 (or 61228 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 51417240 is about 7170.5815663724. The cubic root of 51417240 is about 371.8515421024.

Adding to 51417240 its reverse (4271415), we get a palindrome (55688655).

The spelling of 51417240 in words is "fifty-one million, four hundred seventeen thousand, two hundred forty".