705766821 has 8 divisors (see below), whose sum is σ = 946462560. Its totient is φ = 467791152.

The previous prime is 705766807. The next prime is 705766843. The reversal of 705766821 is 128667507.

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

It is not a de Polignac number, because 705766821 - 2⁷ = 705766693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705766861) 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, 679411 + ... + 680448.

It is an arithmetic number, because the mean of its divisors is an integer number (118307820).

Almost surely, 2^705766821 is an apocalyptic number.

It is an amenable number.

705766821 is a deficient number, since it is larger than the sum of its proper divisors (240695739).

705766821 is a wasteful number, since it uses less digits than its factorization.

705766821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360035.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 705766821 is about 26566.2722450855. The cubic root of 705766821 is about 890.3356142834.

The spelling of 705766821 in words is "seven hundred five million, seven hundred sixty-six thousand, eight hundred twenty-one".