51203040 has 192 divisors, whose sum is σ = 188697600. Its totient is φ = 11665920.

The previous prime is 51203039. The next prime is 51203059. The reversal of 51203040 is 4030215.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164485 + ... + 164795.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^51203040 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 51203040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

51203040 is an abundant number, since it is smaller than the sum of its proper divisors (137494560).

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

51203040 is a wasteful number, since it uses less digits than its factorization.

51203040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 51203040 is about 7155.6299513041. The cubic root of 51203040 is about 371.3344557259.

Adding to 51203040 its reverse (4030215), we get a palindrome (55233255).

The spelling of 51203040 in words is "fifty-one million, two hundred three thousand, forty".