67821442 has 8 divisors (see below), whose sum is σ = 109557756. Its totient is φ = 31302192.

The previous prime is 67821409. The next prime is 67821463. The reversal of 67821442 is 24412876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66569281 + 1252161 = 8159^2 + 1119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 67821398 and 67821407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304233 + ... + 1304284.

Almost surely, 2^67821442 is an apocalyptic number.

67821442 is a deficient number, since it is larger than the sum of its proper divisors (41736314).

67821442 is a wasteful number, since it uses less digits than its factorization.

67821442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608532.

The product of its digits is 21504, while the sum is 34.

The square root of 67821442 is about 8235.3774655446. The cubic root of 67821442 is about 407.8079361614.

The spelling of 67821442 in words is "sixty-seven million, eight hundred twenty-one thousand, four hundred forty-two".