70670781 has 6 divisors (see below), whose sum is σ = 102080030. Its totient is φ = 47113848.

The previous prime is 70670771. The next prime is 70670827. The reversal of 70670781 is 18707607.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 6125625 = 8034^2 + 2475^2 .

It is not a de Polignac number, because 70670781 - 2⁵ = 70670749 is a prime.

It is a super-2 number, since 2×70670781² = 9988718574299922, 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 (70670711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3926146 + ... + 3926163.

Almost surely, 2^70670781 is an apocalyptic number.

It is an amenable number.

70670781 is a deficient number, since it is larger than the sum of its proper divisors (31409249).

70670781 is a wasteful number, since it uses less digits than its factorization.

70670781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852315 (or 7852312 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

The square root of 70670781 is about 8406.5915209436. The cubic root of 70670781 is about 413.4407663130.

The spelling of 70670781 in words is "seventy million, six hundred seventy thousand, seven hundred eighty-one".