51066440 has 64 divisors (see below), whose sum is σ = 122549760. Its totient is φ = 19106560.

The previous prime is 51066409. The next prime is 51066451. The reversal of 51066440 is 4466015.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 42650 + ... + 43830.

It is an arithmetic number, because the mean of its divisors is an integer number (1914840).

Almost surely, 2^51066440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51066440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61274880).

51066440 is an abundant number, since it is smaller than the sum of its proper divisors (71483320).

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

51066440 is a wasteful number, since it uses less digits than its factorization.

51066440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 51066440 is about 7146.0786449633. The cubic root of 51066440 is about 371.0039450035.

The spelling of 51066440 in words is "fifty-one million, sixty-six thousand, four hundred forty".