66846840 has 32 divisors (see below), whose sum is σ = 200540880. Its totient is φ = 17825792.

The previous prime is 66846817. The next prime is 66846869. The reversal of 66846840 is 4864866.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66846792 and 66846801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278409 + ... + 278648.

Almost surely, 2^66846840 is an apocalyptic number.

66846840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66846840 is an abundant number, since it is smaller than the sum of its proper divisors (133694040).

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

66846840 is a wasteful number, since it uses less digits than its factorization.

66846840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557071 (or 557067 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 66846840 is about 8175.9916829703. The cubic root of 66846840 is about 405.8450879955.

The spelling of 66846840 in words is "sixty-six million, eight hundred forty-six thousand, eight hundred forty".