68071821 has 4 divisors (see below), whose sum is σ = 90762432. Its totient is φ = 45381212.

The previous prime is 68071819. The next prime is 68071831. The reversal of 68071821 is 12817086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68071821 - 2¹ = 68071819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68071831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11345301 + ... + 11345306.

It is an arithmetic number, because the mean of its divisors is an integer number (22690608).

Almost surely, 2^68071821 is an apocalyptic number.

It is an amenable number.

68071821 is a deficient number, since it is larger than the sum of its proper divisors (22690611).

68071821 is a wasteful number, since it uses less digits than its factorization.

68071821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22690610.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 68071821 is about 8250.5648897515. The cubic root of 68071821 is about 408.3091598999.

The spelling of 68071821 in words is "sixty-eight million, seventy-one thousand, eight hundred twenty-one".