67888981 has 4 divisors (see below), whose sum is σ = 67976032. Its totient is φ = 67801932.

The previous prime is 67888967. The next prime is 67888991. The reversal of 67888981 is 18988876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67888981 - 2⁵ = 67888949 is a prime.

It is a super-2 number, since 2×67888981² = 9217827482436722, 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 (67888901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42345 + ... + 43918.

It is an arithmetic number, because the mean of its divisors is an integer number (16994008).

Almost surely, 2^67888981 is an apocalyptic number.

It is an amenable number.

67888981 is a deficient number, since it is larger than the sum of its proper divisors (87051).

67888981 is an equidigital number, since it uses as much as digits as its factorization.

67888981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87050.

The product of its digits is 1548288, while the sum is 55.

The square root of 67888981 is about 8239.4769858287. The cubic root of 67888981 is about 407.9432611250.

The spelling of 67888981 in words is "sixty-seven million, eight hundred eighty-eight thousand, nine hundred eighty-one".