70906905 has 12 divisors (see below), whose sum is σ = 122905380. Its totient is φ = 37816992.

The previous prime is 70906897. The next prime is 70906909. The reversal of 70906905 is 50960907.

It can be written as a sum of positive squares in 2 ways, for example, as 28643904 + 42263001 = 5352^2 + 6501^2 .

It is not a de Polignac number, because 70906905 - 2³ = 70906897 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 70906905.

It is not an unprimeable number, because it can be changed into a prime (70906909) 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 11 ways as a sum of consecutive naturals, for example, 787810 + ... + 787899.

It is an arithmetic number, because the mean of its divisors is an integer number (10242115).

Almost surely, 2^70906905 is an apocalyptic number.

It is an amenable number.

70906905 is a deficient number, since it is larger than the sum of its proper divisors (51998475).

70906905 is a wasteful number, since it uses less digits than its factorization.

70906905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575720 (or 1575717 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 70906905 is about 8420.6237892451. The cubic root of 70906905 is about 413.9007148318.

The spelling of 70906905 in words is "seventy million, nine hundred six thousand, nine hundred five".