68467381 has 4 divisors (see below), whose sum is σ = 72494892. Its totient is φ = 64439872.

The previous prime is 68467363. The next prime is 68467409. The reversal of 68467381 is 18376486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18376486 = 2 ⋅9188243.

It can be written as a sum of positive squares in 2 ways, for example, as 55800900 + 12666481 = 7470^2 + 3559^2 .

It is a cyclic number.

It is not a de Polignac number, because 68467381 - 2¹³ = 68459189 is a prime.

It is a super-2 number, since 2×68467381² = 9375564521998322, 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 (68464381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013730 + ... + 2013763.

It is an arithmetic number, because the mean of its divisors is an integer number (18123723).

Almost surely, 2^68467381 is an apocalyptic number.

It is an amenable number.

68467381 is a deficient number, since it is larger than the sum of its proper divisors (4027511).

68467381 is a wasteful number, since it uses less digits than its factorization.

68467381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027510.

The product of its digits is 193536, while the sum is 43.

The square root of 68467381 is about 8274.5018581181. The cubic root of 68467381 is about 409.0985170467.

The spelling of 68467381 in words is "sixty-eight million, four hundred sixty-seven thousand, three hundred eighty-one".