67651381 has 16 divisors (see below), whose sum is σ = 86175360. Its totient is φ = 51701760.

The previous prime is 67651361. The next prime is 67651399. The reversal of 67651381 is 18315676.

It is not a de Polignac number, because 67651381 - 2¹¹ = 67649333 is a prime.

It is a super-2 number, since 2×67651381² = 9153418702414322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67651381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67651301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12700 + ... + 17221.

It is an arithmetic number, because the mean of its divisors is an integer number (5385960).

Almost surely, 2^67651381 is an apocalyptic number.

It is an amenable number.

67651381 is a deficient number, since it is larger than the sum of its proper divisors (18523979).

67651381 is a wasteful number, since it uses less digits than its factorization.

67651381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29964.

The product of its digits is 30240, while the sum is 37.

The square root of 67651381 is about 8225.0459573184. The cubic root of 67651381 is about 407.4667939369.

The spelling of 67651381 in words is "sixty-seven million, six hundred fifty-one thousand, three hundred eighty-one".