51415240 has 16 divisors (see below), whose sum is σ = 115684380. Its totient is φ = 20566080.

The previous prime is 51415219. The next prime is 51415249. The reversal of 51415240 is 4251415.

It can be written as a sum of positive squares in 2 ways, for example, as 50893956 + 521284 = 7134^2 + 722^2 .

It is not an unprimeable number, because it can be changed into a prime (51415249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642651 + ... + 642730.

Almost surely, 2^51415240 is an apocalyptic number.

It is an amenable number.

51415240 is an abundant number, since it is smaller than the sum of its proper divisors (64269140).

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

51415240 is a wasteful number, since it uses less digits than its factorization.

51415240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285392 (or 1285388 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 51415240 is about 7170.4421063139. The cubic root of 51415240 is about 371.8467206799.

Adding to 51415240 its reverse (4251415), we get a palindrome (55666655).

The spelling of 51415240 in words is "fifty-one million, four hundred fifteen thousand, two hundred forty".