67651540 has 48 divisors (see below), whose sum is σ = 159191424. Its totient is φ = 23932800.

The previous prime is 67651537. The next prime is 67651541. The reversal of 67651540 is 4515676.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 67651496 and 67651505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67651541) 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, 3985 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (3316488).

Almost surely, 2^67651540 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 67651540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79595712).

67651540 is an abundant number, since it is smaller than the sum of its proper divisors (91539884).

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

67651540 is a wasteful number, since it uses less digits than its factorization.

67651540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368 (or 8366 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 67651540 is about 8225.0556229122. The cubic root of 67651540 is about 407.4671131576.

The spelling of 67651540 in words is "sixty-seven million, six hundred fifty-one thousand, five hundred forty".