67404381 has 48 divisors (see below), whose sum is σ = 107889600. Its totient is φ = 37255680.

The previous prime is 67404377. The next prime is 67404391. The reversal of 67404381 is 18340476.

It is not a de Polignac number, because 67404381 - 2² = 67404377 is a prime.

It is a super-2 number, since 2×67404381² = 9086701155986322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67404391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 199845 + ... + 200181.

It is an arithmetic number, because the mean of its divisors is an integer number (2247700).

Almost surely, 2^67404381 is an apocalyptic number.

It is an amenable number.

67404381 is a deficient number, since it is larger than the sum of its proper divisors (40485219).

67404381 is a wasteful number, since it uses less digits than its factorization.

67404381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 67404381 is about 8210.0171132587. The cubic root of 67404381 is about 406.9702924506.

The spelling of 67404381 in words is "sixty-seven million, four hundred four thousand, three hundred eighty-one".