70841781 has 12 divisors (see below), whose sum is σ = 102635052. Its totient is φ = 47085696.

The previous prime is 70841759. The next prime is 70841783. The reversal of 70841781 is 18714807.

It can be written as a sum of positive squares in 2 ways, for example, as 38862756 + 31979025 = 6234^2 + 5655^2 .

It is not a de Polignac number, because 70841781 - 2⁹ = 70841269 is a prime.

It is a super-2 number, since 2×70841781² = 10037115870503922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70841783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8646 + ... + 14711.

It is an arithmetic number, because the mean of its divisors is an integer number (8552921).

Almost surely, 2^70841781 is an apocalyptic number.

It is an amenable number.

70841781 is a deficient number, since it is larger than the sum of its proper divisors (31793271).

70841781 is a wasteful number, since it uses less digits than its factorization.

70841781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23700 (or 23697 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 70841781 is about 8416.7559665230. The cubic root of 70841781 is about 413.7739611842.

The spelling of 70841781 in words is "seventy million, eight hundred forty-one thousand, seven hundred eighty-one".