66536840 has 32 divisors (see below), whose sum is σ = 150050880. Its totient is φ = 26553792.

The previous prime is 66536839. The next prime is 66536843. The reversal of 66536840 is 4863566.

It is a junction number, because it is equal to n+sod(n) for n = 66536794 and 66536803.

It is not an unprimeable number, because it can be changed into a prime (66536843) 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, 18467 + ... + 21773.

It is an arithmetic number, because the mean of its divisors is an integer number (4689090).

Almost surely, 2^66536840 is an apocalyptic number.

It is an amenable number.

66536840 is an abundant number, since it is smaller than the sum of its proper divisors (83514040).

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

66536840 is a wasteful number, since it uses less digits than its factorization.

66536840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821 (or 3817 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 66536840 is about 8157.0117077273. The cubic root of 66536840 is about 405.2167513240.

It can be divided in two parts, 66536 and 840, that added together give a palindrome (67376).

The spelling of 66536840 in words is "sixty-six million, five hundred thirty-six thousand, eight hundred forty".