67661983 has 8 divisors (see below), whose sum is σ = 72025200. Its totient is φ = 63379008.

The previous prime is 67661977. The next prime is 67661987. The reversal of 67661983 is 38916676.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67661983 - 2¹³ = 67653791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67661987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18316 + ... + 21697.

It is an arithmetic number, because the mean of its divisors is an integer number (9003150).

Almost surely, 2^67661983 is an apocalyptic number.

67661983 is a deficient number, since it is larger than the sum of its proper divisors (4363217).

67661983 is a wasteful number, since it uses less digits than its factorization.

67661983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40121.

The product of its digits is 326592, while the sum is 46.

The square root of 67661983 is about 8225.6904269490. The cubic root of 67661983 is about 407.4880782391.

It can be divided in two parts, 67661 and 983, that added together give a square (68644 = 262²).

The spelling of 67661983 in words is "sixty-seven million, six hundred sixty-one thousand, nine hundred eighty-three".