70855721 has 4 divisors (see below), whose sum is σ = 71518032. Its totient is φ = 70193412.

The previous prime is 70855679. The next prime is 70855723. The reversal of 70855721 is 12755807.

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 70855721 - 2¹⁴ = 70839337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70855723) 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 in 3 ways as a sum of consecutive naturals, for example, 330995 + ... + 331208.

It is an arithmetic number, because the mean of its divisors is an integer number (17879508).

Almost surely, 2^70855721 is an apocalyptic number.

It is an amenable number.

70855721 is a deficient number, since it is larger than the sum of its proper divisors (662311).

70855721 is a wasteful number, since it uses less digits than its factorization.

70855721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662310.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 70855721 is about 8417.5840358146. The cubic root of 70855721 is about 413.8010997392.

The spelling of 70855721 in words is "seventy million, eight hundred fifty-five thousand, seven hundred twenty-one".