70930781 has 24 divisors (see below), whose sum is σ = 81107520. Its totient is φ = 61737984.

The previous prime is 70930777. The next prime is 70930787. The reversal of 70930781 is 18703907.

It is not a de Polignac number, because 70930781 - 2² = 70930777 is a prime.

It is a super-2 number, since 2×70930781² = 10062351386539922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70930787) 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 23 ways as a sum of consecutive naturals, for example, 367421 + ... + 367613.

It is an arithmetic number, because the mean of its divisors is an integer number (3379480).

Almost surely, 2^70930781 is an apocalyptic number.

It is an amenable number.

70930781 is a deficient number, since it is larger than the sum of its proper divisors (10176739).

70930781 is a wasteful number, since it uses less digits than its factorization.

70930781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 70930781 is about 8422.0413796181. The cubic root of 70930781 is about 413.9471662762.

The spelling of 70930781 in words is "seventy million, nine hundred thirty thousand, seven hundred eighty-one".