67809381 has 4 divisors (see below), whose sum is σ = 90412512. Its totient is φ = 45206252.

The previous prime is 67809373. The next prime is 67809389. The reversal of 67809381 is 18390876.

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 an interprime number because it is at equal distance from previous prime (67809373) and next prime (67809389).

It is a cyclic number.

It is not a de Polignac number, because 67809381 - 2³ = 67809373 is a prime.

It is a super-2 number, since 2×67809381² = 9196224303206322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67809389) 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, 11301561 + ... + 11301566.

It is an arithmetic number, because the mean of its divisors is an integer number (22603128).

Almost surely, 2^67809381 is an apocalyptic number.

It is an amenable number.

67809381 is a deficient number, since it is larger than the sum of its proper divisors (22603131).

67809381 is a wasteful number, since it uses less digits than its factorization.

67809381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22603130.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 67809381 is about 8234.6451653972. The cubic root of 67809381 is about 407.7837606059.

It can be divided in two parts, 6780 and 9381, that added together give a palindrome (16161).

The spelling of 67809381 in words is "sixty-seven million, eight hundred nine thousand, three hundred eighty-one".