67821994 has 4 divisors (see below), whose sum is σ = 101732994. Its totient is φ = 33910996.

The previous prime is 67821961. The next prime is 67821997. The reversal of 67821994 is 49912876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 59089969 + 8732025 = 7687^2 + 2955^2 .

It is not an unprimeable number, because it can be changed into a prime (67821997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16955497 + ... + 16955500.

Almost surely, 2^67821994 is an apocalyptic number.

67821994 is a deficient number, since it is larger than the sum of its proper divisors (33911000).

67821994 is a wasteful number, since it uses less digits than its factorization.

67821994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33910999.

The product of its digits is 217728, while the sum is 46.

The square root of 67821994 is about 8235.4109794229. The cubic root of 67821994 is about 407.8090425440.

The spelling of 67821994 in words is "sixty-seven million, eight hundred twenty-one thousand, nine hundred ninety-four".