66831740 has 24 divisors (see below), whose sum is σ = 147734160. Its totient is φ = 25325568.

The previous prime is 66831733. The next prime is 66831749. The reversal of 66831740 is 4713866.

It is a self number, because there is not a number n which added to its sum of digits gives 66831740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66831749) 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, 87557 + ... + 88316.

It is an arithmetic number, because the mean of its divisors is an integer number (6155590).

Almost surely, 2^66831740 is an apocalyptic number.

It is an amenable number.

66831740 is an abundant number, since it is smaller than the sum of its proper divisors (80902420).

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

66831740 is a wasteful number, since it uses less digits than its factorization.

66831740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175901 (or 175899 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 66831740 is about 8175.0681954342. The cubic root of 66831740 is about 405.8145269781.

The spelling of 66831740 in words is "sixty-six million, eight hundred thirty-one thousand, seven hundred forty".