51012040 has 32 divisors (see below), whose sum is σ = 115299000. Its totient is φ = 20312064.

The previous prime is 51012037. The next prime is 51012047. The reversal of 51012040 is 4021015.

It can be written as a sum of positive squares in 4 ways, for example, as 44116164 + 6895876 = 6642^2 + 2626^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51012040.

It is not an unprimeable number, because it can be changed into a prime (51012047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6376 + ... + 11944.

Almost surely, 2^51012040 is an apocalyptic number.

It is an amenable number.

51012040 is an abundant number, since it is smaller than the sum of its proper divisors (64286960).

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

51012040 is a wasteful number, since it uses less digits than its factorization.

51012040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5809 (or 5805 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 51012040 is about 7142.2713474076. The cubic root of 51012040 is about 370.8721573065.

Adding to 51012040 its reverse (4021015), we get a palindrome (55033055).

Subtracting from 51012040 its reverse (4021015), we obtain a square (46991025 = 6855²).

The spelling of 51012040 in words is "fifty-one million, twelve thousand, forty".