51818240 has 36 divisors (see below), whose sum is σ = 124123944. Its totient is φ = 20726784.

The previous prime is 51818237. The next prime is 51818251. The reversal of 51818240 is 4281815.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18962 + ... + 21521.

Almost surely, 2^51818240 is an apocalyptic number.

It is an amenable number.

51818240 is an abundant number, since it is smaller than the sum of its proper divisors (72305704).

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

51818240 is an equidigital number, since it uses as much as digits as its factorization.

51818240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40504 (or 40490 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 51818240 is about 7198.4887302822. The cubic root of 51818240 is about 372.8157225958.

The spelling of 51818240 in words is "fifty-one million, eight hundred eighteen thousand, two hundred forty".