66850740 has 144 divisors (see below), whose sum is σ = 232989120. Its totient is φ = 15344640.

The previous prime is 66850739. The next prime is 66850747. The reversal of 66850740 is 4705866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66850695 and 66850704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66850747) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36732 + ... + 38508.

It is an arithmetic number, because the mean of its divisors is an integer number (1617980).

Almost surely, 2^66850740 is an apocalyptic number.

66850740 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 66850740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116494560).

66850740 is an abundant number, since it is smaller than the sum of its proper divisors (166138380).

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

66850740 is a wasteful number, since it uses less digits than its factorization.

66850740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66850740 is about 8176.2301826698. The cubic root of 66850740 is about 405.8529804906.

The spelling of 66850740 in words is "sixty-six million, eight hundred fifty thousand, seven hundred forty".