68772221 has 8 divisors (see below), whose sum is σ = 78878784. Its totient is φ = 58736160.

The previous prime is 68772181. The next prime is 68772227. The reversal of 68772221 is 12227786.

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

It is a de Polignac number, because none of the positive numbers 2^k-68772221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68772227) 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 7 ways as a sum of consecutive naturals, for example, 15515 + ... + 19448.

It is an arithmetic number, because the mean of its divisors is an integer number (9859848).

Almost surely, 2^68772221 is an apocalyptic number.

It is an amenable number.

68772221 is a deficient number, since it is larger than the sum of its proper divisors (10106563).

68772221 is a wasteful number, since it uses less digits than its factorization.

68772221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35251.

The product of its digits is 18816, while the sum is 35.

The square root of 68772221 is about 8292.9018443486. The cubic root of 68772221 is about 409.7047666380.

The spelling of 68772221 in words is "sixty-eight million, seven hundred seventy-two thousand, two hundred twenty-one".