51240066 has 8 divisors (see below), whose sum is σ = 102480144. Its totient is φ = 17080020.

The previous prime is 51240019. The next prime is 51240073. The reversal of 51240066 is 66004215.

It is a sphenic number, since it is the product of 3 distinct primes.

51240066 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270000 + ... + 4270011.

It is an arithmetic number, because the mean of its divisors is an integer number (12810018).

Almost surely, 2^51240066 is an apocalyptic number.

51240066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51240066 is a wasteful number, since it uses less digits than its factorization.

51240066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540016.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51240066 is about 7158.2166773576. The cubic root of 51240066 is about 371.4239407566.

The spelling of 51240066 in words is "fifty-one million, two hundred forty thousand, sixty-six".