67991140 has 48 divisors (see below), whose sum is σ = 166666752. Its totient is φ = 22813056.

The previous prime is 67991129. The next prime is 67991141. The reversal of 67991140 is 4119976.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 67991140.

It is not an unprimeable number, because it can be changed into a prime (67991141) 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, 1414 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (3472224).

Almost surely, 2^67991140 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 67991140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83333376).

67991140 is an abundant number, since it is smaller than the sum of its proper divisors (98675612).

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

67991140 is a wasteful number, since it uses less digits than its factorization.

67991140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10396 (or 10394 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 67991140 is about 8245.6740173257. The cubic root of 67991140 is about 408.1477822334.

It can be divided in two parts, 679 and 91140, that added together give a palindrome (91819).

The spelling of 67991140 in words is "sixty-seven million, nine hundred ninety-one thousand, one hundred forty".