66878040 has 64 divisors (see below), whose sum is σ = 202514400. Its totient is φ = 17667072.

The previous prime is 66878027. The next prime is 66878069. The reversal of 66878040 is 4087866.

It is a self number, because there is not a number n which added to its sum of digits gives 66878040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10524 + ... + 15636.

Almost surely, 2^66878040 is an apocalyptic number.

66878040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66878040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101257200).

66878040 is an abundant number, since it is smaller than the sum of its proper divisors (135636360).

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

66878040 is a wasteful number, since it uses less digits than its factorization.

66878040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5236 (or 5232 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 66878040 is about 8177.8994858093. The cubic root of 66878040 is about 405.9082193629.

The spelling of 66878040 in words is "sixty-six million, eight hundred seventy-eight thousand, forty".