70712109 has 20 divisors (see below), whose sum is σ = 113758876. Its totient is φ = 43514496.

The previous prime is 70712101. The next prime is 70712113. The reversal of 70712109 is 90121707.

It can be written as a sum of positive squares in 2 ways, for example, as 13286025 + 57426084 = 3645^2 + 7578^2 .

It is not a de Polignac number, because 70712109 - 2³ = 70712101 is a prime.

It is a super-3 number, since 3×70712109³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70712101) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32524 + ... + 34629.

Almost surely, 2^70712109 is an apocalyptic number.

It is an amenable number.

70712109 is a deficient number, since it is larger than the sum of its proper divisors (43046767).

70712109 is a wasteful number, since it uses less digits than its factorization.

70712109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67178 (or 67169 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 70712109 is about 8409.0492328206. The cubic root of 70712109 is about 413.5213434628.

It can be divided in two parts, 7071 and 2109, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 70712109 in words is "seventy million, seven hundred twelve thousand, one hundred nine".