51258440 has 32 divisors (see below), whose sum is σ = 115992000. Its totient is φ = 20385984.

The previous prime is 51258419. The next prime is 51258443. The reversal of 51258440 is 4485215.

It is not an unprimeable number, because it can be changed into a prime (51258443) 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, 3581 + ... + 10739.

It is an arithmetic number, because the mean of its divisors is an integer number (3624750).

Almost surely, 2^51258440 is an apocalyptic number.

It is a pronic number, being equal to 7159×7160.

It is an amenable number.

51258440 is an abundant number, since it is smaller than the sum of its proper divisors (64733560).

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

51258440 is a wasteful number, since it uses less digits than its factorization.

51258440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7349 (or 7345 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 51258440 is about 7159.4999825407. The cubic root of 51258440 is about 371.4683313312.

The spelling of 51258440 in words is "fifty-one million, two hundred fifty-eight thousand, four hundred forty".