67538981 has 8 divisors (see below), whose sum is σ = 68265984. Its totient is φ = 66815280.

The previous prime is 67538969. The next prime is 67538983. The reversal of 67538981 is 18983576.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67538981 is a prime.

It is a super-2 number, since 2×67538981² = 9123027909036722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67538983) 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, 68216 + ... + 69198.

It is an arithmetic number, because the mean of its divisors is an integer number (8533248).

Almost surely, 2^67538981 is an apocalyptic number.

It is an amenable number.

67538981 is a deficient number, since it is larger than the sum of its proper divisors (727003).

67538981 is a wasteful number, since it uses less digits than its factorization.

67538981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its digits is 362880, while the sum is 47.

The square root of 67538981 is about 8218.2103282892. The cubic root of 67538981 is about 407.2410057124.

The spelling of 67538981 in words is "sixty-seven million, five hundred thirty-eight thousand, nine hundred eighty-one".