67921919 has 8 divisors (see below), whose sum is σ = 77449680. Its totient is φ = 59008896.

The previous prime is 67921883. The next prime is 67921943. The reversal of 67921919 is 91912976.

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

It is a cyclic number.

It is not a de Polignac number, because 67921919 - 2⁸ = 67921663 is a prime.

It is a super-2 number, since 2×67921919² = 9226774161285122, 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 67921919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67921949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153449 + ... + 153890.

It is an arithmetic number, because the mean of its divisors is an integer number (9681210).

Almost surely, 2^67921919 is an apocalyptic number.

67921919 is a deficient number, since it is larger than the sum of its proper divisors (9527761).

67921919 is a wasteful number, since it uses less digits than its factorization.

67921919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307369.

The product of its digits is 61236, while the sum is 44.

The square root of 67921919 is about 8241.4755353638. The cubic root of 67921919 is about 408.0092250093.

The spelling of 67921919 in words is "sixty-seven million, nine hundred twenty-one thousand, nine hundred nineteen".