66862840 has 64 divisors (see below), whose sum is σ = 171279360. Its totient is φ = 23253120.

The previous prime is 66862787. The next prime is 66862847. The reversal of 66862840 is 4826866.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 66862793 and 66862802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66862847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6817 + ... + 13423.

It is an arithmetic number, because the mean of its divisors is an integer number (2676240).

Almost surely, 2^66862840 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 66862840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85639680).

66862840 is an abundant number, since it is smaller than the sum of its proper divisors (104416520).

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

66862840 is a wasteful number, since it uses less digits than its factorization.

66862840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6652 (or 6648 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 66862840 is about 8176.9700990037. The cubic root of 66862840 is about 405.8774655090.

The spelling of 66862840 in words is "sixty-six million, eight hundred sixty-two thousand, eight hundred forty".